The chair looks rather hard, but in fact it is very comfortable . A. sitting B.

The chair looks rather hard, but in fact it is very comfortable _______.

A. sitting B. to sit on

C. to sit　 D. being sat on

试题答案

B

考查不定式短语的用法。句中sit为不及物动词，而与主语it构成逻辑上的动词关系，故sit后应加介词on。