问题补充：
－Can you tell me to travel to Dalian?
－About two hours by plane.
A. how much it costs
B. what I should take
C. how long it takes
D. which is the best season
答案：
A. how much it costs
B. what I should take
(答案→)C. how long it takes
D. which is the best season
解析：句意：---你能告诉我去大连要花费多长时间吗？---乘飞机大约两个小时。根据下面的两个小时，可知问的是多长时间。A花费多少钱；B应该乘什么；C花费多长时间；D最好的季节是什么。故选C。
