Question

Some researchers believe that there is no doubt ________ a cure for AIDS will be found.

A. which                       B. that                           C. what                         D. whether

Answer 1

B

解析:

本题考查名词性从句的同位语，doubt 后的同位语根据意思没有怀疑故选择that 引导，that在从句中不充当成分。