They       have got lost, or had an accident.
A.canB.mightC.mustD.mustn’t
B

試題分析:考查情態(tài)動詞:句意:他們可能迷路了,也可能出事了。Might have done過去可能做了,can用于推測,一般是否定和疑問句中,must have done過去一定做了,mustn’t不能和have done連用,選B。
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