问题

Why! I _____ get you on the phone. — We ______ basketball on the playground when you phoned.
A:didn't; must be playing
B:couldn't; must be playing
C:couldn't; must have played
D:didn't; must have been playing
B:couldn't; must be playing
C:couldn't; must have played
D:didn't; must have been playing
正确答案是:
同类题型
must have been a long trip. — Yeah, it _____ us a whole week to get there.
When do you usually get up on weekends, Lucy— eight o’clock in the morning.
Do you want to eat out, ________ would yourather stay at home— It’s up to you.
I give you my word, I mean what I say, ____________ you come any nearer, I will fire