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

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

出自：石家庄铁道大学大学英语1

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