Some researchers believe that there is no doubt___ a cure for AIDS will be found.
A．whichB．thatC．whatD．whether
B
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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