Mr. Wu___this math problem____him many times, but he still doesn’t understand it
题型：不详难度：来源：
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 |
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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。 |
举一反三
When the teacher came in, all of us _______.| A．stopped talking | B．stopped to talk | C．stop talking | D．stop to talk |
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Our country _______ a lot in the last fifty years. | A．will change | B．changed | C．changes | D．has changed |
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—Where ___________ you go yesterday? —I ___________ to the beach.| A．did; go | B．did; went | C．do; go | D．do; went |
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| I ________a primary school student two years ago. |
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