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It was 3 years ago ______ he came back.

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It was 3 years ago ______ he came back.
我知道答案是after,请知道的告诉我,
原题是:用before after since填空
It was 3 years ______ he came back.
It was 3 years ago ______ he came back.
It is 3 years ______ he came back.
It was 3 years ago ______ he came back.
也可以填when的吧?
另一种说法,It had been three years before he came back.
It has been three years since he came back.