第15题: [单项选择]This company has now introduced a policy ________ pay rises are related to performance at work. A. which B. where C. whether D. what 参考答案:B 答案解析:本题考查语法结构。从语义上分析,后半句应是修饰policy的一个定语从句。 which不可以用来引导该定语从句,因为which总要在从句中充当一定的成分。 whether 与 what 不引导定语从句