在我国，并非所有大城市的市中心都为中心商务区。
对
在我国，并非所有大城市的市中心都为中心商务区。例如北京的市中心就是行政区。
The place _____ the bridge is supposed to be built should be _____ the cross-river traffic is heaviest.
A．which; where
B．at which; which
C．at which; where
D．which; in which
鱼际
