They had walked only about 500 meters ___ Mary felt great pain in her stomach.答案用when /before

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They had walked only about 500 meters ___ Mary felt great  pain in her stomach.答案用when /before

They had walked only about 500 meters ___ Mary felt great pain in her stomach.答案用when /before
They had walked only about 500 meters ___ Mary felt great pain in her stomach.答案用when /before

They had walked only about 500 meters ___ Mary felt great pain in her stomach.答案用when /before
when:当Mary感到肚子剧烈疼痛时,她们才走了500米.
before:在Mary感到肚子剧烈疼痛之前,她们才走了500米.

我认为应是when

用before,在他们刚走了500米后mary就觉得胃疼了。

从语法上来说,when和before都正确。
这里主要考的是过去完成时态。表示过去某一时间或动作之前已经发生或完成的动作或存在的状态。句中常用by, before, when, until等词引导的时间状语。它是以过去某一时间为起点,所以过去完成时是一个相对的时态,表示的是“过去的过去”。
语法上都正确但是意义不同,before含有在……之前的意思,when在这里是当……的时候。...

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从语法上来说,when和before都正确。
这里主要考的是过去完成时态。表示过去某一时间或动作之前已经发生或完成的动作或存在的状态。句中常用by, before, when, until等词引导的时间状语。它是以过去某一时间为起点,所以过去完成时是一个相对的时态,表示的是“过去的过去”。
语法上都正确但是意义不同,before含有在……之前的意思,when在这里是当……的时候。

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Only after__ for three hours in the train hours in the rain did the reach the destination.A.they had walked B.had they walked C.they walk D.do they walk They had walked only about 500 meters ___ Mary felt great pain in her stomach.答案用when /before they slowly some had and dinosaurs legs short walked造句 hong long have you been here only about five minutess.herry and simon here with me选项 A have walked B were walking C had walked D walked they walked ____the street. 英语翻译Long ago,there was a young poor boy.He had no family.He only had an old camel.Each day the boy and his camel walked many miles looking for a home.Each night they stayed together and slept in the open air.But one evening,the old camel died ___snacks and drink,but they also brought cards for entertainment when they had a picnic in the forest.A.Not only they brought B.Not only did they bring C.Not only brought they D.Not only they did bring Not only _____ away from them but also their only sonA.everything they had was takenB.everything they had taken wasC.was everything they had takenD.everything was taken they had They had talked only for a few minutes( )they found they were of different opinions.unlesswhilebeforeonce很着急 They do not live in the city.They are only _____(visit) They had fun_____(watch)TV. She walked into the lobby,rubbing her face,trying not to look suspicious.If only she ( )a mirror with her!However,her face would betray her.A.have B.would C.would have had D.had had after the patients went into the office ,---- working选啥啊,最好说明理由A only a doctor did they see B only a doctor saw they C only a doctor they saw D only a doctor had they seen After the patients went into the office,__working.A.only a doctor did they see B.only a doctor saw they C.only a doctor they saw D.only a doctor had they seen 英语单项选择:They hurried to the cinema,____the film had finished.They hurried to the cinema,____the film had finished.A.only findingB.only to findC.only foundD.only find 27.34mot only__away from them but also their only sona.everything they had was takenb.everything they had taken wasc.was everything they had takend.everthing eas taken they had Only after they had discussed the matter for several hours ______ an agreement.A.they reached B.do they reach C.they reach D.did they reach Only after they had discussed the matter for several hours ______ an agreement.A.they reached B.do they reach C.they reach D.did they reach They had only one room to _____.A:live B:stay C:live in D:keep