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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:

本題考查同位語從句的引導(dǎo)詞。題意為:一些研究人員認為,人們一定會找到治療艾滋病的方法的。Doubt后接同位語從句時,如用于肯定句中,要用whether引導(dǎo);如用于否定句中則用that引導(dǎo)。

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