—How is it from Xi’an to Dunhuang?—It’s less than 3 flight.A. long, hour’sB. far, hour’

—How is it from Xi’an to Dunhuang?—It’s less than 3 flight.
A. long, hour’s
B. far, hour’s
C. long, hours’
D. far, hours’

A. long, hour’sB. far, hour’sC. long, hours’(答案→)D. far, hours’解析：句意：从西安到敦煌多远？- 不到三个小时的飞行路程。问两地之间的距离，用how far\. 时间的名词所有格加’s.如果是以s结尾的复数名词只是在s后加’，根据句意，故选D。

回答的不错