(2013·湖南長(zhǎng)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(dòng)詞。句意為：——這封信是你母親寫(xiě)來(lái)的吧？——是的。但這封信不可能是她自己寫(xiě)的，因?yàn)樗粋�(gè)字也不認(rèn)識(shí)。根據(jù)because引導(dǎo)的原因狀語(yǔ)從句可知，此處應(yīng)用can’t have done表示對(duì)過(guò)去發(fā)生的事很有把握的否定推測(cè)。
答案：　B
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