It is immediately clear the financial crisis will soon be over. A. sinceB. whatC. whenD.

问题补充：

It is immediately clear the financial crisis will soon be over.

A. since

B. what

C. when

D. whether

答案：

A. since

B. what

C. when

(答案→)D. whether

解析：考查名词性从句。按照句意选择连接词，此处为是否之意，故选whether连接的从句做主语，it为形式主语。