问题描述：
The old man was very strict and he didn't let us ______(come)in.这题为什么填原型?
---what should i do?
---_____go and say sorry to him.这里为什么要填Why not,而不能填Why not you?
---what should i do?
---_____go and say sorry to him.这里为什么要填Why not,而不能填Why not you?
问题解答：
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