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    精英家教网 > 高中英语 > 题目详情
    (2014·济南市名校第四次诊断性测试)—Is the letter from your mother?
    —Yes.But she ________the letter herself，because she doesn’t even know one word.
    A．needn’t have written　B．can’t have written
    C．might not have writtenD．should not have written
    B
    考查情态动词。句意为：——这封信是你母亲寄来的吧？——是的。但这封信不可能是她自己写的，因为她一个字也不认识。根据because引导的原因状语从句可知，此处应用can’t have done表示对过去发生的事很有把握的否定推测。
    答案：　B
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