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Everyone can borrow from this public library only two books _____ and they must be returned within a month.

A.at one time B.at times C.at the time D.at a time

D

解析本题的含义是每个人每次可以在图书馆借2本书,他们必须在一个月内归还。at a time可以表示一次或每次的意思,故本题选D。

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