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People dump garbage into this lake,which ____ pollution of t

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People dump garbage into this lake,which ____ pollution of the water.
adds up to
adds to
leave behind
leave alone
选哪个 为什么?
People dump garbage into this lake,which ____ pollution of t
B add to 增加
人们把垃圾丢了河中,增加了湖水的污染.
河水本来就有污染,所以只能说“增加”
adds up to 总计达到(某个数字)
leave behind丢弃;留下;忘记携带
leave alone 听其自然,不要去管