SAT一道写作/语法/改错题

题目

SAT一道写作/语法/改错题
My father insists that before buying a used car,have it thoroughly inspected by a reputable mechanic.
(buying a used car,have it划线)
A.不改
B.改为buying a used car,it is
C.改为buying a used car,I have it
D.改为I buy a used car to have it
E.改为I buy a used car having it
正确答案是C,可是我不太明白...我选的是B

答案

因为before buying a used car这个时间状语从句是要放在整个宾语里面的,因此要和insist that后引导的宾语从句中的主语要能够搭配.如果选B it is.则宾语从句中的主语就变成了used car .而时间状语从句可以看出,动作的...