Before you leave the lab, the doors and windows ____shut in case of rain.A.isB.a
题型:不详难度:来源:
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 |
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答案
D |
解析
考查be to do结构。主语是the doors and windows,谓语要用复数,排除A,C;be to do sth.一定要做某事。句意:你离开实验室前,一定要把门窗关好,以免下雨。所以选D。 |
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