52单词网 > 高中英语 > 高中英语题库 > These diagrams are especially helpful when we have a concrete problem at hand.A.

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

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

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

A.be solved

B.to solve

C.solved

D.being solved

试题答案

B

试题

标签：wewhenconcretehavehelpful

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