last year 已经表明是过去式了 is being 表示现在进行时或将来时
has been 表示现在完成时：现在完成时（Present perfect）过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态.
故选1
a new building ___________ in the last year求填空
4个回答
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