题干
If there are ______ trees, the air in our city will be _______ cleaner.
A：less, more
B：more, more
C：more, much
D：much, more
答案(点此获取答案解析）
C
If there are ______ trees, the air in our city will be _______ cleaner.
A：less, more
B：more, more
C：more, much
D：much, more
