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20.According to a new study by a British university, learning    second language can lead to

    increase in your brain power.

     A.a ;the             B.不填; the         C.a ;an             D.the ;不填

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19.-Has he finished writing his essay?

     -No. He    on it when I went to see him this morning.

     A.worked           B.was working      C.had worked       D.is working

试题详情

18.Finding her car stolen,     .

     A.a policeman was asked to help          B.the area was searched thoroughly

     C.it was looked for everywhere            D.she hurried to a policeman for help

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