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    【题目】That was the fourth time that Mr. Smith __________the Summer Palace.

    A. has visited B. visits

    C. had visited D. to visit

    【答案】C

    【解析】考查过去完成时。句意为“这已经是史密斯先生第四次参观颐和园了。主句时态为一般过去时，从句时态应该用过去完成时，若主句时态为一般现在时，则从句应用现在完成时。故选C。

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