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：这题第一空考查定语从句，先行词是the place，定语从句中不缺主宾表，填at which=at the place，第二空填where，是表语从句，意为：在…地方，句意是：这座桥应该建的地方是过河车辆最多的地方。选C。