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:

本題考查名詞性從句的同位語,doubt 后的同位語根據(jù)意思沒有懷疑故選擇that 引導(dǎo),that在從句中不充當(dāng)成分。

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