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    Mr. Wu___this math problem____him many times, but he still doesn’t understand it.

    A．explains ; toB．has explained ; forC．has explained ; toD．explained ; with

    C

    解析试题分析：句意：吴老师给他讲了几遍这道数学题目，但他还是不懂。句中用现在完成时，have/has+动词过去分词，表示过去发生的事情对现在有影响，主语是第三人称单数，所以用has explained; explain…to sb.向某人解释，介词用to，故选C。
    考点：考查时态。

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