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单选题
The speed _____ light travels is very high.
A
which
B
at which
C
in which
D
with which
参考答案
参考解析
解析：
which代替先行词在后面的定语从句中作at的宾语。travel at ... speed以什么样的速度传播，介词不能省略，故选B。
which代替先行词在后面的定语从句中作at的宾语。travel at ... speed以什么样的速度传播，介词不能省略，故选B。
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共用题干
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共用题干
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共用题干
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