There is no doubt our educational system leaves something to be desiredA. whatB. whether

问题补充：

There is no doubt our educational system leaves something to be desired．

A. what

B. whether

C. if

D. that

答案：

A. what

B. whether

C. if

(答案→)D. that

解析：考查同位语从句：句意：毋庸置疑,我们的教育体系,留给了我们一些为之憧憬的东西.即 有不足之处!There is no doubt that…，毫无疑问…，that引导的是同位语，说明doubt的内容，如果是There is doubt后面用whether，选D。