We must do everything we can _______ waste water from running into rivers.

题型：单选题题类：常考题难易度：容易

2016年新目标英语中考复习：语法综合检测(二)

A、keep B、kept C、to keep D、keeping

举一反三

—Sorry, I it to my cousin yesterday.

—Yes, they are very popular among young people.

—No, you _________. You can finish it by the end of this week.

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