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
C. at which ;where
D. which ;in which
解析：“he bridge is supposed to be built”是定语从句，修饰名词place。“he cross-river traffic is the heaviest”组在句中做表语，表语从句引导词中没有in which，两空结合