—Excuse me Maria. Can I use your bike?—Sure. Here you are. But you must return it time.A

问题补充：

—Excuse me, Maria. Can I use your bike?

—Sure. Here you are. But you must return it time.

A. in

B. at

C. on

D. to

答案：

A. in

B. at

(答案→)C. on

D. to

解析：句意：打扰一下，玛利亚，我可以用你的自行车吗？当然可以，给你，但你必须按时归还。in time 及时，on time 按时。结合句意故选C。