问题补充：
Let me tell you .
A. how much is the car
B. how much does the car cost
C. how much did I pay for the car
D. how much I spent on the car
答案：
A. how much is the car
B. how much does the car cost
C. how much did I pay for the car
(答案→)D. how much I spent on the car
解析：句意：让我告诉你我买这辆车花了多少钱。此处how much 引导的是一个宾语从句，从句中应用陈述语序，并且时态要与主句一致，故选D。
