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        1. ________they decide which college to go to,students should research the admission procedures.
          A.As            B.While
          C.Until D.Once
          D
          考查連詞。once在句中引導(dǎo)狀語從句,表示“一旦”。句意為:一旦學(xué)生決定上哪個大學(xué),他們就應(yīng)該了解一下入學(xué)手續(xù)。其他幾項(xiàng)不合題意。
          答案: D
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