补充材料第72

For many people, household labor remains demanding (even if able to afford household appliances their grandparents would find a miracle)

A

B

Ceven if they can afford household appliances their grandparents would have found miraculous.

答案是C，可是不明白C的结构啊

完整结构是这样的：

For many people, household labor remains demanding even if they can afford household appliances (that) their grandparents would have found miraculous.

省略了that.

their grandparents would have found miraculous用来修饰限定household appliances。