I have made clear that all of us are strongly against smoking in the office.A. thisB. itC

问题补充：

I have made clear that all of us are strongly against smoking in the office.

A. this

B. it

C. that

D. one

答案：

A. this

(答案→)B. it

C. that

D. one

解析：此题考查it 作形式宾语，真正的宾语是后面的that从句。所以选B。