问题
选择题
— This is _____ useful book. I think.
— So it is, and it's _____ unusual one. [ ]
A. an, 不填
B. an, an
C. a, an
D. a, a
答案
答案：C
搜题请搜索小程序“爱下问搜题”
— This is _____ useful book. I think.
— So it is, and it's _____ unusual one. [ ]
A. an, 不填
B. an, an
C. a, an
D. a, a
答案：C