问题补充:
单选题Thecostofsalesmakesupalargepartofthepricesthat_____.A.are paid for all productsB.all products are paidC.for which all products are paidD.for all products paid
答案:
A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。