I bought two film tickets yesterday I paid $40.A. whichB. at whichC. whenD. for which

问题补充：

I bought two film tickets yesterday, I paid $40.

A. which

B. at which

C. when

D. for which

答案：

A. which

B. at which

C. when

(答案→)D. for which

解析：考查定语从句。本题的定语从句的先行词是two film tickets,在定语从句中which作为for的宾语。句子是一个固定词组pay for…付钱买…;本题是把定语从句中的介词提前到关系词的前面，定语从句的关系词前面的介词有三种来源：先行词的固定搭配，定语从句中的固定搭配，以及根据句子的意思选择的介词。昨天我买了两种电影票，为此我付了40美元。故D正确。