The airport express departs from platform 3 every 20 minutes during the day (every 30 minutes at night).

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问题 The airport express departs from platform 3 every 20 minutes during the day (every 30 minutes at night).

选项 A、The train service to the airport runs 24 hours a day.
B、Airport trains leave Platform 3 at 20 minutes past the hour.
C、The airport express takes half an hour at night.