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        1. -________ keep water running when you are brushing your teeth or washing your hands, Jack.

          -OK.I know we must save every drop(滴)of water.

          [  ]

          A.

          Why not

          B.

          Please

          C.

          Don't

          答案:C
          解析:

            考查祈使句的否定形式。第一句句意:杰克,當(dāng)你 刷牙或洗手時(shí)不要讓水不停地流淌。祈使句的否定形式在句首加don't,故選C。


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