5.The chair looks rather hard,but in fact it is very comfortable ________ .A.to sit B.to sit on C.sit D.be sat on选哪一个,为什么?

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5.The chair looks rather hard,but in fact it is very comfortable ________ .A.to sit B.to sit on C.sit D.be sat on选哪一个,为什么?
5.The chair looks rather hard,but in fact it is very comfortable ________ .
A.to sit B.to sit on
C.sit D.be sat on
选哪一个,为什么?

5.The chair looks rather hard,but in fact it is very comfortable ________ .A.to sit B.to sit on C.sit D.be sat on选哪一个,为什么?
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 答案:B.如果不定式为不及物动词,其后应有必要的介词.