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were there.there were

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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.
were there.there were
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
were there.there were There were 用There were和There were造句 There was,There were造句, There was/were问题 There were coins everywhere. Were there any sharks? my friends were there, 用There were .造句 谱子 there were roses there were three old... when were you there