Some researchers believe that there is no doubt______a cure for AIDS will be found.
A．whetherB．that
C．whatD．which
B

試題分析：考查名詞性從句。there is no doubt that...“......是毫無疑問的”；that引導(dǎo)同位語從句，解釋說明doubt所指的內(nèi)容。故選B。
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