题目

The place __________ the bridge is supposed to be built should be ________ the cross-river traffic is the heaviest.       A．which; where      B．at which; which   C．at which; where   D．which; in which 答案：C 解析：本题考查了定语从句的有关知识。第一空用at which可以使之在引导定语的同时在从句中充当表语。

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