问题

Some researchers believe that there is no doubt ____ a cure for AIDS will be found.

A:which
B:that
C:what
D:whether

正确答案是：

同类题型

Have you seen the film The War Horse?— Of course, I have. It was in my hometown ______ it was made.[ ]

下列各句中，没有语病的一句是（）

Run as quickly as you can, otherwise you ___ in the heavy rain soon

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