They       have got lost, or had an accident.

A．canB．mightC．mustD．mustn’t

B

解析試題分析：考查情態(tài)動(dòng)詞：句意：他們可能迷路了，也可能出事了。Might have done過(guò)去可能做了，can用于推測(cè)，一般是否定和疑問(wèn)句中，must have done過(guò)去一定做了，mustn’t不能和have done連用，選B。
考點(diǎn)：考查情態(tài)動(dòng)詞

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