Question

As a rule, you can borrow only two books ______ in the library.

A．at one time

B．at a time

C．in no time

D．at times

Answer 1

B

“作为一个规定，一次你只能从图书馆借一本书。”at one time“曾经”，at a time”一次”，in no time“立刻”，at times“有时候”，所以答案B。