had 用在这句话中是否是倒装形式？

来源：百度知道 编辑：UC知道 时间：2024/05/30 04:32:37
they're looking to Uncle Sam for investment — an investment that could have been avoided had Washington imposed more stringent mileage standards years earlier
请指教

不是， an investment （that could have been avoided ） had Washington imposed more stringent mileage standards years earlier
这样看就明白了吧 括号中的是一个定于从句，此处 had是一个使役动词

不是 是investment的定语从句 后面的都是 省掉了that