问题补充：
— Sunday morning, they are going to get up early .
—That’s good , but I’m going to stay in bed the morning .
A. On , on
B. In, in
C. In , on
D. On, in
答案：
A. On , on
B. In, in
C. In , on
(答案→)D. On, in
解析：考介词，在星期天的早晨、在星期天，都应该用on,例on Monday/Sunday;在早晨 就用 in，例in the morning/afternoon/evening .
