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Before you leave the lab, the doors and windows shut in case of rain.A.isB.areC.

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Before you leave the lab, the doors and windows shut in case of rain.A.isB.areC.

Before you leave the lab, the doors and windows ____shut in case of rain.

A.is

B.are

C.is to be

D.are to be

试题答案

D

标签：anddoorswindowsinshut

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