Lucy often gets up9:00Sunday morning.A. at on B. at in C. in on D. in in

问题补充：

Lucy often gets up9:00Sunday morning.

A. at, on

B. at, in

C. in, on

D. in, in

答案：

(答案→)A. at, on

B. at, in

C. in, on

D. in, in

解析：在表示时间时,in表示在一个时间范围;at表示在具体时刻;on表示在具体某一天.本句中九点为具体时刻,故用介词at.星期日上午为具体某一天,故用介词on,选A.