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【题目】These diagrams are especially helpful when we have a concrete problem ______ at hand.

A. be solved B. to solve C. solved D. being solved

【答案】B

【解析】B 考察非谓语动词。句义:如果我们手边没有解决的具体问题,你们这些数据就非常有用,have在此表示有,后面接不定式的形式。

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