Hi,I haven't seen you for a long time.---I__ in Beijing.I've just come back.答案是shall be,was为什么不可以呢

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Hi,Ihaven''tseenyouforalongtime.---I__inBeijing.I''vejustcomeback.答案是shallbe,was为什么不可以呢Hi,Ihaven''tseen

Hi,I haven't seen you for a long time.---I__ in Beijing.I've just come back.答案是shall be,was为什么不可以呢
Hi,I haven't seen you for a long time.---I__ in Beijing.I've just come back.答案是shall be,
was为什么不可以呢

Hi,I haven't seen you for a long time.---I__ in Beijing.I've just come back.答案是shall be,was为什么不可以呢
为什么不是should be ,不是过去式吗……?

时态不同啦，was是过去式。

同问………………