问题

You must return these books ________ next Monday, or you will be fined. [ ]
A: on
B: in
C: by
D:at
B: in
C: by
D:at
正确答案是:
同类题型
Mum, I don’t like drinking milk. —- For your health, dear, you _______ .
_______ for your step, Jim, or you might fall into the lake. – Well, I got it.
That clothes store is ________ on weekends.–I see. I’ll go there next Monday then.
He works very hard. Every night he doesn’t go to bed _____eleven o’clock.[ ]