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
