You should consider carefully the car you want to buy is worth the money.
A. that
B. which
C. whether
D. what
网友回答
A. that
B. which
(答案→)C. whether
D. what
解析： 句意：你应该认真思考是否你想买的车值这个价钱。Consider后面接的是宾语从句，根据句意应该用whether连接宾语从句，表示“是否”，that连接宾语从句的时候，从句的意思是完整的，which哪个，what什么，所以选C。