答案是【polluting】
这里涉及了两个词组的区别：
【stop to do】：停下现在做的,去做另外一件事
【stop doing】：只是停下现在做的事
翻译：我们必须停止污染地球了.
因此只能用【stop doing】形式
祝学业进步!
we must stop-_____(pollute) our earth
3个回答
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