问题补充：
will it take us to fly to Hainan and will the trip to Hainan cost us?
A. How much, how long
B. How long, how much
C. How much, how much
D. How long, how long
答案：
A. How much, how long
(答案→)B. How long, how much
C. How much, how much
D. How long, how long
解析：根据题目中的内容第一空句子中的动词为take，用how long，表示花费多长时间，而第二空根据单词cost可知问的是花费多少钱，故选答案为B
