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

问题描述:

It is not immediately clear ______ the financial crisis will soon be over.
A.since B.what C.when D.whether
为什么D不行?

答案肯定是D
如果一定要选择C为答案,你必须去掉SOON,因为soon与when冲突了.也就是说,有了soon就不能用when.没有soon的话,答案是whether或者when.没有soon的话,答案是whether或者when。