题干
--_________?
--I'm sixteen.
A：How many years are you
B：What years are you
C：How old are you
D：How are you
答案(点此获取答案解析）
C
--_________?
--I'm sixteen.
A：How many years are you
B：What years are you
C：How old are you
D：How are you
的单调递增区间为（ ）