we are not clear about the degree()the accident will affect us.A.by whichB to whichC for whichD.on which选B为什么不选D呢,还有请问什么时候需要在现行词前面加介词啊!谢谢

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we are not clear about the degree()the accident will affect us.
A.by which
B to which
C for which
D.on which
选B为什么不选D呢,还有请问什么时候需要在现行词前面加介词啊!谢谢

which这里是代指degree
to degree到...的程度
至于要不要加介词,关键在于它在从句中充当的成分
这里的从句是
the accident will affect us to degree.