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        1. They have been doing morning exercises            they            up.
          A.since, gotB.for, getC.since, getD.for, got
          A

          試題分析:根據(jù)since后面跟從句或表示時(shí)間點(diǎn)的短語,for后面跟表示時(shí)間段的短語的用法和they可知,后面應(yīng)該是從句,故應(yīng)該排除BD;又根據(jù)since后面的從句用過去時(shí),可知本題應(yīng)該選A。
          點(diǎn)評(píng):完成本題需要注意兩點(diǎn):一個(gè)是since和for都可用于現(xiàn)在完成時(shí),since后面跟從句或表示時(shí)間點(diǎn)的短語,而for后面跟表示時(shí)間段的短語;一個(gè)是since后面應(yīng)該用過去時(shí)。
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