The speed Tom drives his car is too high.A. in which B. at which C. at that D. in what

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A. in which
(答案→)B. at which
C. at that
D. in what
解析：考查定语从句中关系词与介词的连用。定语从句中关系词前面的介词有3个来源：先行词的固定搭配，定语从句中的固定搭配：句子的语义；本题的先行词与介词at是固定搭配。at the speed of以…的速度；句意：Tom开车的速度太快了。故B正确。