We had to spend three more hours waiting in cafe at the airport because flight was delayed.
A. a; the
B. 不填; the
C. the; 不填
D. a; a
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(答案→)A. a; the
B. 不填; the
C. the; 不填
D. a; a
解析：考查冠词：第一空填a，泛指“机场的一家咖啡店”，第二空填the，特指“我们乘坐的航班”，句意：我们不得不在机场的咖啡店再等3个小时，因为航班被延误了。选A。