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A lot of fish in the river because there lots of pollution.

A. has died; is B. have died; is C. has died; are D. have died; are

B 【解析】句意:因为大量的污染,河里许多鱼死亡了。因主句的主语A lot of fish 在这里是复数,单复数同形,所以用have;从句的主语 pollution不可数名词,所以用is;故选B
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