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These diagrams are especially helpful when we have a concrete problem ________ at hand.
A.be solvedB.to solve
C.solvedD.being solved
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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