问题补充：
---Your sister bought a camera last week, didn’t she?
---Yes, and it her a lot.
A. spent
B. paid
C. took
D. cost
答案：
A. spent
B. paid
C. took
(答案→)D. cost
解析：此题重点考查cost，spend，pay，take四个花费的区别；cost的主语是物常用句型结构是sth cost some money；spend的主语是人，常用的句型结构是sb spend some time/money in doing sth; pay的主语是人，常用句型结构是sb pay something some money；take的主语是it，常用句型结构是it takes sb some time to do sth
