单选题The speed _____ light travels is very high.AwhichBat whichCin whichDwith which
单选题
The speed _____ light travels is very high.
A
which
B
at which
C
in which
D
with which
参考解析
解析：
句意：光传播的速度非常快。which代替先行词在后面的定语从句中作at的宾语。“以什么样的速度传播”应该是travel at ... speed，介词不能省略，故选B。
句意：光传播的速度非常快。which代替先行词在后面的定语从句中作at的宾语。“以什么样的速度传播”应该是travel at ... speed，介词不能省略，故选B。
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