问题补充：
单选题Ineed50yuanto___forwintercamp.Ihavetoaskmyfatherforsomemoney.A.costB.payC.takeD.spend
答案：
B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
