作业帮It __ten years since he left Shanghai.为什么用is,不用had been.意思是“从那时有多久”？
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It __ten years since he left Shanghai.为什么用is,不用had been.意思是“从那时有多久”？
It __ten years since he left Shanghai.
为什么用is,不用had been.
意思是“从那时有多久”？
It __ten years since he left Shanghai.为什么用is,不用had been.意思是“从那时有多久”？
it is...since 是固定用法
用has been , is肯定不对的。
had been时态不对，是过去完成时
这里是讲述一个事实,所以要用一般现在时.
用was就会导致后面的时态变诚since he had left shanghai.了
要是用had been,后面的时态就更不对了!
It __ten years since he left Shanghai.为什么用is,不用had been.意思是“从那时有多久”？
it's years since i
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