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Because of such factors, engineers have worked on increasing the efficiency of elevators, resorting to double-decker cars to service and to transfer systems that ______ express and local elevators.

单选题
Because of such factors, engineers have worked on increasing the efficiency of elevators, resorting to double-decker cars to service and to transfer systems that ______ express and local elevators.

Aexplore

Benforce

Cdeploy

Dstrengthen

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