Question

【题目】You can only borrow two books _______ if you don’t have a library card.

A. on time B. in time

C. from time to time D. at a time

Answer 1

【答案】D

【解析】

试题分析：句意：如果你没有借书证的话，你每次只能借两本书。此题考查固定短语at a time每次，根据句意，应选D。