-Why didn’t Susan come to see us yesterday as she promised?-______. 
#87312
A
She must be busy
B
She might have been free
C
She must have been busy
D
She can’t be free
推荐题目
 ________ the arrival of the police, I would have been robbed by two masked men.
#86495
A
Had it not been for
B
If it were not for
C
Had it been not for
D
If it would not be for
Thank you for all your hard work last week. I don’t think we ______ it without you.
#90484
A
can manage
B
could have managed
C
could manage
D
can have managed