(2013·湖南長沙四校二模)—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
考查情態(tài)動詞。句意為：——這封信是你母親寫來的吧？——是的。但這封信不可能是她自己寫的，因為她一個字也不認識。根據(jù)because引導的原因狀語從句可知，此處應(yīng)用can’t have done表示對過去發(fā)生的事很有把握的否定推測。
答案：　B
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