问题
In our city, people always see the blue sky this year. What do you think of it— I think trees we plant, air our city will have.
A:the less; the cleaner
B:the most; the cleanest
C:the more; the cleaner
D:the least; the cleanest;
B:the most; the cleanest
C:the more; the cleaner
D:the least; the cleanest;
正确答案是：
