题目内容
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
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题目内容
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