问题 选择题

(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 written

D.should not have written

答案

答案: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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