题干
--How old ____________ your cat?
--I think ____________ one.
A：is, it
B：are, it's
C：is, it's
D：are; is
答案(点此获取答案解析）
C
--How old ____________ your cat?
--I think ____________ one.
A：is, it
B：are, it's
C：is, it's
D：are; is
