The problem this material can be used in our factory has been solved.A．thatB．whatC．whetherD．why 题目和参考答案——青夏教育精英家教网—

题目内容

The problem ________ this material can be used in our factory has been solved.

A．that

B．what

C．whether

D．why

考查同位语从句。That引导的同位语从句That this material can be used in our factory说明The problem的内容。

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