I didnt see your sister at home.if she ____,she would have met me.A has come B did come C had come答案为什么是C请说理由另外B为什么不可以,did come我不可以理解为确实来了嘛..

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I didnt see your sister at home.if she ____,she would have met me.A has come B did come C had come答案为什么是C请说理由另外B为什么不可以,did come我不可以理解为确实来了嘛..
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I didnt see your sister at home.if she ____,she would have met me.A has come B did come C had come答案为什么是C请说理由另外B为什么不可以,did come我不可以理解为确实来了嘛..
I didnt see your sister at home.if she ____,she would have met me.
A has come B did come C had come
答案为什么是C
请说理由
另外B为什么不可以,did come我不可以理解为确实来了嘛..

I didnt see your sister at home.if she ____,she would have met me.A has come B did come C had come答案为什么是C请说理由另外B为什么不可以,did come我不可以理解为确实来了嘛..
这是条件句(CONDITIONAL SENTENCES )的固定答配,请熟记.
英文条件句有三种基本结构:
1.现在式 + 将来式
If yougo ,I'll go too.
2.过去式 + 现在条件式
If you went ,I would go too.
3.过去完成式 + 过去条件式
If you had gone ,I would have gone too.
你的句子属于第三种句型,所以必须用 “had come”,这是语法所规定.
如果她那天已经来了,我就一定会见到她的 .(因为她没来,所以我那天没有见到她在家)