Fiona goes to bed 9 o’clock every day.A. ofB. inC. onD. at

问题补充：

Fiona goes to bed 9 o’clock every day.

A. of

B. in

C. on

D. at

答案：

A. of

B. in

C. on

(答案→)D. at

解析：句意：菲奥娜每天9点钟睡觉。在具体的几点钟用介词at,在具体的某一天用介词on,在年，月份前面用介词in,故选D