问题补充：
—Your shoes are so old. Why don’t you buy a new pair?
—Because I all my money on an MP5.
A. spend
B. have spent
C. am spending
D. was spending
答案：
A. spend
(答案→)B. have spent
C. am spending
D. was spending
解析：句意：你的鞋太旧了。为什么不买一双新的？——因为把我所有的前都花在MP5上了。结合语境可知下文描述的是现在已经完成的动作，故用现在完成时态。选B。
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