题干
—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(点此获取答案解析）
C
—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
