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
网友回答
A. which; where
B. at which; which
(答案→)C. at which; where
D. which; in which
解析：主要测试表语从句。句子意思：建设大桥的地方应该是过河交通最拥挤的地方。第一空属于定语从句；第二空属于表语从句，而且结合语境此处缺少状语。故此选择where。