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

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

【答案】B

【解析】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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