问题
选择题
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
答案：C
The place是先行词，在定从 the bridge is supposed to be built中在地点状语，用at which或where；should be后面是表语从句 the cross river traffic is the heaviest.，该从句缺少地点状语，用where引导。所以选C。