题型：语法填空（单句）题类：常考题难易度：普通

鲁教版（五四制）七年级上册Unit 5 Where did you go on vacation? Period 3 Section B (1a-2e) 同步练习

This way doesn't work. Let's try (open) the door in another way.

举一反三

— Yes. They harmful gases and clean the air.

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