Waste tends to be the pollution problem other problems are eventually reduced.A. of which B. to whic

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【题目】Waste tends to be the pollution problem _______ other problems are eventually reduced.

A. of which B. to which

C. by which D. through which

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【答案】B

【解析】考查定语从句。句意：浪费导致污染问题，其他问题最终也会成为污染问题。 be reduced to“使变弱为……；沦为……”是固定短语。故选B。