【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
在线课程【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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These diagrams are especially helpful when we have a concrete problem at hand.A. be solved B. to sol
编辑：chaxungu时间：2026-04-27 03:08:21分类：高中英语题库
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