◎ 题干
(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
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◎ 解析
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◎ 知识点
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