蓝皮Section 1两题

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

D. although they could afford household appliances their grandparents would find miraculous

正确答案已代入，烦请解释一下区别。

2. At the time of the Mexican agrarian revolution, the most radical faction, that of Zapata and his followers, proposed a return to communal ownership of land, to what had been a pre-Columbian form of ownership respected by the Spaniards.

B. land, a form of ownership of the pre-Columbians and respected by the Spaniards.

题中正确答案的what怎么解释，是communal ownership of land的同位语么？B为什么不行呢？

请赐教！

1、

although前后要求事态一致，而D的could与remains不一致

2、to what在原句补充上省略的成分后是

（a reture to） what had been a ...

是对前句a reture to communal ownership of land的补充说明

B 的问题在and respected没有东西和它对应，把and去掉后没有什么问题了