A week-long raining is coming, , the farmers say, will do harm to the growth of plants.A.

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A. it
B. that
C. what
(答案→)D. which
解析：考查非限制性定语从句。the farmers say作插入语，which指前半句话的含义。句意：长达一周的下雨即将到来，农民们说，这将对作物的成长有害。所以选D。