其实是考词组
become……die形如make sth.done
这句话的意思是“河受污染让许多鱼死了”,表示一种河污染的状态,已经被污染了,用过去式是可以的,因为句子中有表示对现在的影响（就是死了很多鱼）所以最好用现在完成时,污染到哪个程度呢?——污染到很多与死了的程度,而鱼是被河的污染“搞死的”,所以die要用过去分词
因此最佳正确答案应该是has become……died（最好答案）
当然你也可以用became died
the river _(become) polluted a lot of fish _ (die)
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