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to turn off the electricity before you leave.A.Make sureB.Be sureC.SurelyD.Sure

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to turn off the electricity before you leave.A.Make sureB.Be sureC.SurelyD.Sure

________ to turn off the electricity before you leave.

A.Make sure

B.Be sure

C.Surely

D.Sure

试题答案

B

be sure可和不定连用;make sure多和that从句连用。故选B项。