--- The MP3 cost me about 2,000 yuan.
--- Well, it was crazy of you to spend so much money you could buy a cheaper one.
A. when
B. unless
C. if
D. because
网友回答
(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 。