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(2013·湖南长沙四校二模)—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:——这封信是你母亲写来的吧?——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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