The room is very dirty today.It's hard——.A.cleaning B.to clean it C.to learning D.to clean

分类: 作业答案 • 2023-01-08 23:36:36

问题描述：

The room is very dirty today.It's hard——.A.cleaning B.to clean it C.to learning D.to clean
选什么,为什么

答

选B,It's hard to clean it.= To clean it is hard.
当句子的主语比较长时,可用it作为形式主语,后面用不定式作真正的主语.