问题
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;
B:at times
C:at the time
D:at a time;
正确答案是：
同类题型
I have a really bad headache, and I have to __________ a doctor about my pains.[ ]
class, when the bell rang and the teacher closed his book, it was a ______for everyone to stand up
believed that things wouldget worse, but ____ it is they are getting better
_____ all the seats full, he had no choice but to stand up.
ou go by train, please see toit_______ you take an express, _______ that stops only at big stations