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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：因為大量的污染，河里許多魚死亡了。因主句的主語A lot of fish 在這里是復數，單復數同形，所以用have；從句的主語 pollution不可數名詞，所以用is；故選B
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