【題目】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年以來不止一個學生已經(jīng)被派遣到最困難的地方。since 1979用于現(xiàn)在完成時，主語為More than one student，謂語用單數(shù)。選C。

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