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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】

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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