动词不定时的被动式!The chair looks rather hard,but in fact it is very

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动词不定时的被动式!
The chair looks rather hard,but in fact it is very comfortable to ___.A.sit B.sit on C.be seat D.be sat on B.如果不定式为不及物动词,其后应有必要的介词.当动词与介词连用时,常位于"形容词+动词不定式"结构的末尾.
我还是不明白为什么要选B而不选D.

这句话中有一个句型,就是It is+adj.+to do sth
其次就是sit 不及物动词,不能直接加宾语,所以就是sit on
seat是及物动词,C选项改成seat就可以了.

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