The problem______this material can’t be used in our factory has not been solved.

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问题 The problem______this material can’t be used in our factory has not been solved.

选项 A、that
B、what
C、whether
D、why

答案 A

解析本题考查同位语从句的用法。分析句子结构可知，先行词为(the)problem，其后的this material can’t be used in our factory是problem的具体内容，所以确定这是同位语从句而非定语从句，因此选A。

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