The MP3 cost me about 2 000 yuanWell it was crazy of you to spend so much mone

问题补充：

--- The MP3 cost me about 2,000 yuan.

--- Well, it was crazy of you to spend so much moneyyou could buy a cheaper one.

A. when

B. unless

C. if

D. because

答案：

(答案→)A. when

B. unless

C. if

D. because

解析： 四个学校分别表示当……时候、除非、如果和因为，根据题意选A，嗯，你疯了，当你能买一个更便宜的的时候，你花这么多钱 。