Some researchers believe that there is no doubta cure for AIDS will be found.A. whetherB.

问题补充：

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

A. whether

B. that

C. what

D. which

答案：

A. whether

(答案→)B. that

C. what

D. which

解析：考查名词性从句。there is no doubt that...“......是毫无疑问的”；that引导同位语从句，解释说明doubt所指的内容。故选B。

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