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-________ 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,当你 刷牙或洗手时不要让水不停地流淌。祈使句的否定形式在句首加don't,故选C。


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