It is impossible so much work in an hour. A. finish B. to finish C. finishing

问题补充：

It is impossible so much work in an hour.

A. finish B. to finish C. finishing

答案：

解析：本题的it形式主语，真正的主语应位于句尾，用动词不定式to do来表示，故本

题的答案只能选B,to finish。