.The place the bridge is supposed to be built should be the cross-river traffic is the h

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A. which; where.
B. which; in which.
C. at which; which..
(答案→)D. at which; where.
解析：the place做先行词，且在定语从句中作地点状语,所以应是where/at which. 第二空应是表语从句引导词,由句意可知表语从句中不缺主语和表语,缺地点状语,故选where.
句意：建桥的地方应该是车流量最大的地方。