was at the end of the meeting that Mr. Smith made the decision .A. ThisB. ItC. ThatD. 不填

问题补充：

was at the end of the meeting that Mr. Smith made the decision .

A. This

B. It

C. That

D. 不填

答案：

A. This

(答案→)B. It

C. That

D. 不填

解析：考查代词的用法。此处it作形式主语，代指真正的主语tha Mr. Smith made he decision. 只有it可以做形式主语。