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They have got lost, or had an accident. ...

They       have got lost, or had an accident.

A. can        B. might    C. must      D. mustn’t

 

B 【解析】 试题分析:考查情态动词:句意:他们可能迷路了,也可能出事了。Might have done过去可能做了,can用于推测,一般是否定和疑问句中,must have done过去一定做了,mustn’t不能和have done连用,选B。 考点:考查情态动词
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