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 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
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

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
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.