It's comfortable_______ on the sofa.A.sat B.sitting C.to sit
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It's comfortable_______ on the sofa.A.sat B.sitting C.to sit
It's comfortable_______ on the sofa.A.sat B.sitting C.to sit
It's comfortable_______ on the sofa.A.sat B.sitting C.to sit
B、
Sitting on the sofa is comfortable~
sitting
c 类似的还有 :It's easy /difficult to learn.等一类的。符合it's+形容词 +to do 结构
选C,it is comfortable to do sth
选B sitting
it 作为形式主语代替后面的sitting on the sofa
原句可以改为:Sitting on the sofa is comfortable....
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