问题补充：
did you study English? ------More than one year.
A. When
B. What time
C. How long
D. How often
答案：
A. When
B. What time
(答案→)C. How long
D. How often
解析：考查情景交际。“你学英语多久了？”“一年多了。”When= What time“何时”；How long“多久”；How often“多久一次”。对时间提问用how long。故选C。
