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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?

题目详情
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?
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答案和解析
您好,很开心为您解答
前一题是因为let sb do sth,即let后接不带to的动词原形
后一题因为why not do sth是固定搭配,why not do sth=why don't sb do sth
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