Some researchers believe that there is no doubt ______ a cure for AIDS will be found.?
A．which
B．that?
C．what
D．whether?
B
句中a cure for AIDS will be found是對(duì)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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