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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 考察非謂語動詞。句義：如果我們手邊沒有解決的具體問題，你們這些數(shù)據(jù)就非常有用，have在此表示有，后面接不定式的形式。
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