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()3.―turnoffthelightwhenyouleavetheroom.—OK.Iwill.A.AresureofB.BesuretoC.MakesurethatD.Makesureof

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(   ) 3. ―________   turn off the light when you leave the room. 

     —OK. I will.

A. Are sure of    B. Be sure to C. Make sure that    D. Make sure of

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3. B be sure to do sth.意为"一定要做某事"。