Everyone can borrow from this public library only two books _____ and they must
题型：不详难度：来源：
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 |
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答案
| 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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