_a good many hotels and restaurants have been built in the city of Tianjinb.In the past ten years d.During the past ten years 为何选b b,d有何区别

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_a good many hotels and restaurants have been built in the city of Tianjinb.In the past ten years d.During the past ten years 为何选b b,d有何区别
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_a good many hotels and restaurants have been built in the city of Tianjinb.In the past ten years d.During the past ten years 为何选b b,d有何区别
_a good many hotels and restaurants have been built in the city of Tianjin
b.In the past ten years
d.During the past ten years
为何选b b,d有何区别

_a good many hotels and restaurants have been built in the city of Tianjinb.In the past ten years d.During the past ten years 为何选b b,d有何区别
主要是时态的区别.b、d都是在过去的10年中,用in表示事情是在过去10年中完成的,用during则表示过去10年一直在做此事.

在一段时间之内
In the past ten years:具体不知是何时
During the past ten years:特指时间

A.In the past/ last ten years 要和现在完成时态连用