-What time do you usually get up on weekends Lily?-I get up . 7:00.A. byB. forC. inD. at

问题补充：

-What time do you usually get up on weekends , Lily?-I get up . 7:00.

A. by

B. for

C. in

D. at

答案：

A. by

B. for

C. in

(答案→)D. at

解析：句意：在周末你通常什么时候起床莉莉？我在七点起床。By通过；for为；in 在……里；at在。表示在某一具体时刻习惯用介词at，所以选D。