Over forty years (pass)______ since the first bridge was built in the district.

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问题 Over forty years (pass)______ since the first bridge was built in the district.

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答案has passed

解析 自从在这一地区建造了第一座大桥以来,四十多年过去了。在这里,since是连词,意为"自从",引导时间状语从句。当从句用一般过去时时,主句用一般现在时或现在完成时。根据句意本句用现在完成时较合适。
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