seven days 代表时间 ,是一个整体
是表达时间的一个过程式的名词
所以用 is .
seven days is a long time为什么要用is
seven days is a long time为什么要用is
不用are呢
不用are呢
英语人气：726 ℃时间：2020-02-20 22:31:08
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