He was hiding hehind the door___he could see what wai happen

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He was hiding hehind the door___he could see what wai happening.
A.which
B.from where
C.from which
D.where
Here is so difficult a problem____none of us can solve.
A.which
B.that
C.as
D.what
我知道答案,你选什么,为什么选这个的原因,特别是第2道的先行词与关系代词是什么,为什么不选B,怎么翻译.

1 B
from where就直接指地方,where是代词指代的是hiding behind the door 这个位置.
2 C
这里的as 引导定语从句,在从句中as指代problem在从句作宾语,
即这是一个没有一个人能解决的问题、
如果选B的话,后面少了一个it
应该死Here is so difficult a problem that none of us can solve it,

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