Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
A．whichB．thatC．whatD．whether
主要測試同位語從句。結(jié)合平時的學習可知單詞doubt后面的引導詞：肯定句中用whether或if；否定句中用that。因此答案已經(jīng)明了。意思：一些研究人員相信治療艾滋病的方法一定會找到的。例如：I have no doubt that he will come。我相信他會來的。
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