People can send letters in the 两个横线?post office 还是offices
问题描述：
People can send letters in the 两个横线?post office 还是offices
答
post office
the post office已经是指一类，不必复数
答
post office
the post office 本身就泛指了,不用+s
如果+s的话就不用+the
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