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        1. _________that river ________very clean?
          A.Did ;use to B.Did ;use to be C.Does ;used to D.Does ;use to be
          B

          試題分析:句意:那條河過去干凈嗎?used to的一般疑問句應(yīng)借助助動詞did,即Did ---use to do---? 由于clean是形容詞,要與系動詞be連用,故應(yīng)選B。
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