题目内容：
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
参考答案：
选择题：The flight was supposed to take off at ten o’clock
- 题目分类：石家庄铁道大学-大学英语3
- 题目类型：选择题
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A、 in vain
B、 in advance
C、 in case
D、 in effect