[D25] It is not immediately clear ______ the financial crisis will soon be over.

问题描述:

[D25] It is not immediately clear ______ the financial crisis will soon be over.
A.since B.what C.when D.whether
请翻译,并分析.

暂时还不清楚金融危机是否会立即结束.
看后面是完整的句子,主谓宾都有的话,不可能用what之类的,when时间状语,whether才是条件状语,since 可表示原因 也用于后接时间.