【题目】 I have no idea _______ we can do with these waste materials.
A. that
B. what
C. whether
D. if
在线课程【答案】B
【解析】
试题分析：考查副词。 句意：我不知道我们可以用这些废料来做些什么。What指代后面我们可以做的事，这是一个宾语从句，所以选B。
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