I was really anxious about you. You______ home without a word.
A．mustn’t leaveB．shouldn’t have left
C．couldn’t have leftD．needn’t leave
B    

試題分析：考查情態(tài)動詞+have done的含義，從第一句話可知是對過去的虛擬，排除AD項(xiàng)，B. shouldn’t have left本不該做…而做了，C. couldn’t have left過去不可能做了。句意：我真的對你很擔(dān)心，你不該一句話不說就走了。選B。
點(diǎn)評：考查情態(tài)動詞+have done的含義有兩種：一種是虛擬語氣：如could have done本可以做卻沒做，一種是推測：如:must have done過去一定做了什么。結(jié)合上下文做出判斷。
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