请解释下:(非)限制性定语从句,谓语,状语,关系词 等一些英语语法上常出现的词.
还有什么定语从句部分的内容不是很懂,希望能够帮忙.
For example:
1.All the neighbors admire this family,______the parents are treating their child like a friend.
A.why B.where C.which D.that
2.We went through a period_____communications were very difficult in the rural areas.
A.which B.whose C.in which D.with which
3.He has lost the key to the drawer_____the papers are kept.
A.where B.on which C.under which D.which
个人选了CDB,请指点.谢了.