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

问题补充：

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

A. which

B. what

C. that

D. whether

答案：

A. which

B. what

(答案→)C. that

D. whether

解析：考查句型：there is no doubt that 毫无疑问做某事，故选C。

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