Question

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

Answer 1

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。