Some scientists believe that         is no doubt         a cure for AIDS will be found.
A．it; thatB．it; whetherC．there; thatD．there; whether
C
句意：科學家相信，毫無疑問，艾滋病的治療方案終將被找到。Believe后面的that引導賓語從句，在從句中第一空用it做形式主語，that引導真正的主語。
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