Airisoneofthebiggestproblemsin

更新 2022-09-03
科目英语
题型单选题
难度中等
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- Air_______ is one of the biggest problems in the world today
- Yes. We must take action to make the air less_______.

A．pollution; pollution	B．pollute; pollution
C．pollution; pollute	D．pollution; polluted

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