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 。