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题目内容
（石家庄铁道大学-大学英语二）
The flight was supposed to take off at ten o’clock, but ________ we had to wait until eleven o’clock.
A、 in vain
B、 in advance
C、 in case
D、 in effect
A、 in vain
B、 in advance
C、 in case
D、 in effect
参考答案