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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

题目详情
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
▼优质解答
答案和解析
为什么不是should be ,不是过去式吗……?