The reason ______ he gave for being late was _______ he overslept this morning.我认为填which,但是习题答案是why,能说明为什么吗

The reason ______ he gave for being late was _______ he overslept this morning.我认为填which,但是习题答案是why,能说明为什么吗
The reason ______ he gave for being late was _______ he overslept this morning.
我认为填which,但是习题答案是why,能说明为什么吗

The reason ______ he gave for being late was _______ he overslept this morning.我认为填which,但是习题答案是why,能说明为什么吗
which .he give me the reason for being late was.
the reason做宾语补足语

第一空应该不是why吧，根据我的经验好像是第一空不填，第二孔that

楼上what_soup说的有道理.
在这里the reason why he gave for being late应该是他对为什么迟到给出的原因

why= for which

你问的是第一个空还是第二个？
the reason why是固定搭配。