Question

Some researchers believe that there is no doubt___ a cure for AIDS will be found

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

答案B
本题考查同位语从句的引导词。题意为：一些研究人员认为，人们一定会找到治疗艾滋病的方法的。Doubt后接同位语从句时，如用于肯定句中，要用whether引导；如用于否定句中则用that引导。