Some scientists believe that &

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

A．it; that

B．it; whether

C．there; that

D．there; whether

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C

句意：科学家相信，毫无疑问，艾滋病的治疗方案终将被找到。Believe后面的that引导宾语从句，在从句中第一空用it做形式主语，that引导真正的主语。

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