Question

The cost of sales makes up a large part of the prices that _____.

1. A.
   are paid for all products
2. B.
   all products are paid
3. C.
   for which all products are paid
4. D.
   for all products paid

Answer 1

A
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。