问题

Not once _____ their plan.
A:did they change
B:they changed
C:changed they
D:they did change
B:they changed
C:changed they
D:they did change
正确答案是:
同类题型
__________ — I like tennis and football best.
The couple have decided to______ buying a car until their economic condition becomes much better.[ ]
I happened to meet Lily yesterday—Lucky dog!You ________each other for two years
joy, only a small numberof people voted against it, and the majority were it.