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
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