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

A. explains ; to   B. has explained ; for  C. has explained ; to  D. explained ; with

 

【答案】

C

【解析】

試題分析：句意：吳老師給他講了幾遍這道數(shù)學題目，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。

考點：考查時態(tài)。

 

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