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

A.which

B.that?

C.what

D.whether?

B


解析:

句中a cure for AIDS will be found是對no doubt的完全解釋，所以這里需要引導(dǎo)同位語從句的引導(dǎo)詞that。?

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