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    You should understand the math problem now, you have had it ______ three times.

    A. explaining
    B. to explain
    C. explained
    D. explain
    C
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    科目：初中英语 来源：期中题 题型：单选题

    You should understand the math problem now, you have had it ______ three times.
    [     ]
    A. explaining
    B. to explain
    C. explained
    D. explain

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