I have no idea _______ we can do with th...

I have no idea _______ we can do with these waste materials.

A. that

B. what

C. whether

D. if

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。考点：考查副词

考点分析：

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