The cost of sales makes up a large part of the prices that .
A. are paid for all products
B. all products are paid
C. for which all products are paid
D. for all products paid
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(答案→)A. are paid for all products
B. all products are paid
C. for which all products are paid
D. for all products paid
解析：本题考查的是定语从句，that是引导定语从句的关系代词，指代the prices，在从句中充当被动语态的主语，故C是结构错，D是语态错，pay的搭配是pay the price for，因此for不可省，故B也错。