题目内容:
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
参考答案:
答案解析:
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