Before you leave the lab, the doors and windows _shut in case of rain. A. is B. are C. is to be D.
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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
选D为什么?
选D为什么?
这句话的大体意思是:如果下雨了,在你离开实验室之前要关上门和窗户。
选D原因如下:
1.Doors and windows是复数所以用are,由此排除A、C选项
2.门和窗户被人关,是被动语态所以使用Be + 动词的过去分词,而shut的过去分词还是shut,所以选D,由此排除B项
doors和windows都是复数名词,因此排除A和C
又因为door和window都是物体,所以是“被关”
sth be down
shut的原形和现在分词同形
明白了么?
1.复数
2.被动语态
I don not know.
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