问题补充：
--- did it the conductor to check the tickets this morning?
--- Half an hour.
A. How soon; take
B. How long; cost
C. How often; spent
D. How long; take
答案：
A. How soon; take
B. How long; cost
C. How often; spent
(答案→)D. How long; take
解析：考查情景交际。“今天早上那个售票员用了多久检完了票？”“半小时。”How soon“多久之后”用于将来时；How often对频率提问；How long对时间长短进行提问。花费时间用take，花费钱用cost，spend的主语是人。故选D。
