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    【题目】—How long _____each other before they _____here?

    —For about a year.

    A. have they known, come B. did they know, came

    C. do they know, come D. had they known, came

    【答案】D

    【解析】

    考查时态。句意：—他们来这儿之前认识多久了？—大约一年了。根据句意分析，他们来到这里是过去的事，他们互相了解大约一年的时间肯定发生在来这里之前，发生在过去某一动作之前的动作，应该使用过去完成时。故D选项正确。

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