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Tom hasn’t come to work since last Friday.       he have had an accident?
A.MustB.CouldC.ShouldD.Might
B

试题分析:考查情态动词,Must表示必须,Could表示可能,Should表示应该,Might表示可能,Could+完成式表示过去为实现的动作;Might+完成式表示过去,句子意思“汤姆自从上周五没来上班,是不是他可能出事了”,所以选B
点评:情态动词是个难点,表示推测时must语气最强。做题时需要注意表达什么意思,根据意思选出正确答案。
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