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—Is the letter from your mother?

—Yes. But she ________ the letter herself, because she doesn't even know one word.

Aneedn't have written Bcan't have written

Cmight not have written Dshould not have written

 

B

【解析】B 考查情态动词。句意:这封信是你母亲来的吧?”“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。

 

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