题干
I usually stay ______ bed ______ Sunday morning.
A：at; in
B：in; on
C：on; on
D：for; on
答案(点此获取答案解析）
B
I usually stay ______ bed ______ Sunday morning.
A：at; in
B：in; on
C：on; on
D：for; on
至少有一个为0”，应假设
