【单选题】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
 
【单选题】The place ______ the bridge is supposed to be built should be ______ the cross-river traffic is the heaviest.
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