He didn’t make clear when and where the meeting would be held. . A. this B. that C. it D.

问题补充：

He didn’t make clear when and where the meeting would be held. .

A. this

B. that

C. it

D. these

答案：

A. this

B. that

(答案→)C. it

D. these

解析：考查it作形式主语，it代替when and where the meeting would be held其他选项均不可以充当形式宾语。