13、_______ you turn off all the lights when you are away from the classroom .

A．Making sure            B．To make sure          C．Being sure        D．Make sure

13、D

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科目：高中英語(yǔ) 來源： 題型：

       you turn off all the lights when you are away from the classroom.

       A．Making sure        B．To make sure      C．Being sure          D．Make sure

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科目：高中英語(yǔ) 來源： 題型：

_______ you turn off all the lights when you are away from the classroom .

A．Making sure            B．To make sure          C．Being sure        D．Make sure

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