单选题 It is natural for young people to be critical of their parents ______.
A. at a time B. between time C. at times D. at the time

【正确答案】 C

【答案解析】[解析] at times“有时”；at a time“一次；每次”；at the time of“在……时”；不说between time，但说between times“偶尔，间或”。