he can pass the entrance examination is quite uncertain.A. IfB. WhatC. ThatD. Whether

问题补充：

he can pass the entrance examination is quite uncertain.

A. If

B. What

C. That

D. Whether

答案：

A. If

B. What

C. That

(答案→)D. Whether

解析：考查连词。If、what不能引导名词性从句，that从句不能放于句首，he can pass the entrance examination为名词性从句，故只能使用连词whether，选D。