to say which one I should choose.A. That’s hardB. It is hardC. There no useD. It no good

问题补充：

to say which one I should choose.

A. That’s hard

B. It is hard

C. There no use

D. It no good

答案：

A. That’s hard

(答案→)B. It is hard

C. There no use

D. It no good

解析：it 作形式主语，后面的不定式短语作真正的主语。