第一个是【polluting】
固定搭配【prevent sb from doing sth】防止某人做某事
翻译：我们必须防止人们污染河流.
第二个是【are】【doing】
由于【at present】是现在的意思,因此用正在进行时
翻译：他们现在在做什么?
We must prevent people from _(pollute) the river.
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