— There was less air during the COVID-19 outbreak （爆发）. — Well, I think t's because most

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1. (2021七上·深圳期中) — There was less air      during the COVID-19 outbreak （爆发）.
— Well, I think t's because most people      went out then.

A . problem；never B . pollution；always    C . pollution；seldom

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广东省深圳市育才二中2021-2022学年七年级上学期英语期中考试