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题目内容
（石家庄铁道大学大学英语1）
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
