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

题目简介

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

题目详情

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

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

题型：单选题难度：中档来源：不详

答案

B

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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