He made clear when he would give us a lecture on global warming.A. thisB. itC. thatD. thes

问题补充：

He made clear when he would give us a lecture on global warming.

A. this

B. it

C. that

D. these

答案：

A. this

(答案→)B. it

C. that

D. these

解析：考查宾语从句。本题中it是形式宾语，真正的宾语从句是when he would give us a lecture on global warming.句意：他说的很清楚，他何时要给我们做一个关于全球变暖的演讲。故B正确。