问题
选择题
We can never expect ________ bluer sky unless we create ________ less polluted world. [ ]
A. a; a
B. a; the
C. the; a
D. the; the
答案
答案：A
搜题请搜索小程序“爱下问搜题”
We can never expect ________ bluer sky unless we create ________ less polluted world. [ ]
A. a; a
B. a; the
C. the; a
D. the; the
答案：A