问题
选择题
— How about buying an iPhone 4s for your mother’s birthday?
— Oh, maybe it’s too expensive, Dad. Do you know _______?
A．how much does it cost
B．how much it costs
C．how much it cost
D．how much did it cost
答案
答案：B
本题是特殊疑问句作宾语从句，要用陈述句语序。故选B