---Let’s go out for a walk.-- -We’d better not. These days the air is getting mu

题干

---Let’s go out for a walk.
-- -We’d better not. These days the air is getting much _______.

A．better

B．cleaner

C．easier

D．worse

上一题下一题 0.65难度单选题更新时间:2019-02-17 09:32:00

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