问题
选择题
Some researchers believe that there is no doubt______a cure for AIDS will be found.
A．whether
B．that
C．what
D．which
答案
答案：B
题目分析：考查名词性从句。there is no doubt that...“......是毫无疑问的”；that引导同位语从句，解释说明doubt所指的内容。故选B。