There are two building ,______stands nearly a hundred feet high.

There are two building ,______stands nearly a hundred feet high.
A、the large B、the large of them C、the large one that D、the large of which
(我觉得B\D都可以额.另外希望大哥大姐可以给我大概说一下,到底什么时候是定语重句,什么时候是状语重句）
———is often the case,we have worked out the production plan
A、Which B、When C、What D、As (As在句首肿么用丫?）
American women ususlly identify their best friend as someone _______they can talk frequently
A\who b\as cabout which d\with whom
He was educated at a local grammar school,_____he went on to Shanghai.
A\from b\after that c\after which d\from this
求哥哥姐姐可以给我些详细的解答.赠10分（定语重句肿么看.状语重句肿么看）