题型：单选题题类：常考题难易度：普通

牛津深圳版英语七年级下册Unit 5 Water 单元测试.

________ is important ________ the water in the river clean.

A、It; keep B、It; to keep C、That; keep D、That; to keep

举一反三

—He learned it by _______.

— What will you do ________ it then?

—It's hot.

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