问题补充：
-----Do you usually take a vacation?
-----Yes, I like to go away.
A. one time this year
B. once a year
C. one time a year
D. one time in a year
答案：
A. one time this year
(答案→)B. once a year
C. one time a year
D. one time in a year
解析：次数 + a year/ month/ week 是常用固定搭配，表示一年/月/周一次。
