were there.there were_____ no air,there would be no sound.a.were there b.there were c,is there d.there is分析;答案是a我就是不知道a,和b有什么区别,为什么一个必须在前,一个必须在后.

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were there.there were
_____ no air,there would be no sound.
a.were there b.there were c,is there d.there is
分析;答案是a
我就是不知道a,和b有什么区别,为什么一个必须在前,一个必须在后.

如果没有空气,世界将没声音
句中省略了If,所以there be变为be there