When I was 15, my family moved to Washington. I tried skateboarding there, but the locals were far less welcoming. Within a couple of years, I'd given it up. [摘自2021全国卷甲,C]
请问上面语境中的句子within a couple of years, I'd given it up为什么使用过去完成时态表达。谢谢老师!
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