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

試題分析：句意：吳老師給他講了幾遍這道數(shù)學(xué)題目，但他還是不懂。句中用現(xiàn)在完成時，have/has+動詞過去分詞，表示過去發(fā)生的事情對現(xiàn)在有影響，主語是第三人稱單數(shù)，所以用has explained; explain…to sb.向某人解釋，介詞用to，故選C。
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