问题
选择题
-- Do you know _ her mobile phone?
一 No, I think it cost her around 4000 yuan.
A．when your sister paid for
B．how much your sister will pay for
C．how much your sister paid for
D．when did your sister buy
答案
答案：C
题目分析：句意:-你知道你的姐姐买手机花了多少钱吗？-不，我想大约会花费她4，000元。根据句意和下面的回答可知，这里是问他的姐姐买手机花费了多少钱，故可排除A和D；并且他的姐姐已经买了手机，所以这里应该用过去时态。故选C。