【题目】—I wonder why Sam is late again.
—Well，he ________ his train，or maybe overslept.
A.might miss
B.must miss
C.may have missed
D.must have missed

【答案】C
【解析】考查情态动词的推测语气。句意：——我很困惑怎么Sam又迟到了？——哦，他可能错过了火车，或者可能睡过了头。此处首先使用may/might+have done的形式表示对过去发生事情的不确定的推测，依据句子中的maybe一词可知前面对于错过火车也是推测，故选C项合适。