The boss refused to sell the car for he thought was not satisfactory.
A. that
B. which
C. how
D. what
网友回答
A. that
B. which
C. how
(答案→)D. what
解析：what he thought这是一个主语从句，what在从句中宾语，that，which 和how这三个都不能作宾语，故选D。for这里是并列连词，表原因。句意：老板拒绝卖那辆车，因为他想的那些事不是满意的。