问题
Why! I couldn’t get you on the phone this morning.—We ________ tennis in the yard when you phoned me.
A:could be playing
B:must be playing
C:must have been playing
D:should have played
B:must be playing
C:must have been playing
D:should have played
正确答案是：
同类题型
d me that he had two girl-friends,neither of _______ knew anything about the other.
The student couldn’t _________what the teacher was trying to explain.
How long ________inBeijing-For just the weekend. I’II be back for worknext Monday.
Trees and flowers ________every year to make our country more beautiful.