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    【题目】More than one student __________ sent to the hardest place since 1979.

    A. is B. are

    C. has been D. have been

    【答案】C

    【解析】句意：自1979年以来不止一个学生已经被派遣到最困难的地方。since 1979用于现在完成时，主语为More than one student，谓语用单数。选C。

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