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I that all windows are shut.I did it.A.make sureB.am sureC.make clearD.am clear

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I that all windows are shut.I did it.A.make sureB.am sureC.make clearD.am clear

I________that all windows are shut.I did it.

A.make sure

B.am sure

C.make clear

D.am clear

试题答案

B

be sure that 确信,保证;make sure that 确保。