These diagrams are especially helpful when we have a concrete problem at hand.A．be solvedB．to solveC．solvedD．being solved 题目和参考答案——青夏教育精英家教网—

题目内容

These diagrams are especially helpful when we have a concrete problem ________ at hand.

A．be solvedB．to solve

C．solvedD．being solved

【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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