My brother is honest. He _____ such a thing.
A．might not doB．can’t have doneC．can doD．mustn’t have done
B
考查情態(tài)代詞用法。有把握的肯定推測(cè)用must,有把握的否定推測(cè)用can’t.根據(jù)句意可知是對(duì)過去發(fā)生的事情進(jìn)行推測(cè)。結(jié)合句意可知是否定。句意：我的兄弟很誠(chéng)實(shí)。他不可能做了這樣的事情。
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