The chair looks rather hard,but in fact it is very comfortable to ______.
A． sit
B． be sat
C． be sat on
D． sit on
我想问to sit on能否换成to be sat on?因为椅子是被坐嘛.虽说一般不及物动词没有被动语态,但不是有说不及物动词后面加介词形成一个动词短语就可以有被动语态了吗?