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题目
how much are the blue trousers?I would like to buy that pair of jeans?how much is it?
为什么上面用are,下面用is?

提问时间:2020-08-07

答案
上句主语是 the blue trousers ,复数
第二句主语是 that pair of jeans ,看做整体,在于pair ,所以用 is.
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