问题

If we _____ the tickets half a year ago, we would not be able to visit it on May Day now
A:did not book
B:had not booked
C:would not book
D:would not have booked
B:had not booked
C:would not book
D:would not have booked
正确答案是:
同类题型
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What does your mother like doing at the weekends—-She enjoys _______ with her friends.
is developing a rural health careservice system, ____ I’m sure more residents will benefit.
The tourists, had enjoyed themselves so much in the botanic garden, were worn out