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

问题补充：

Tom hasn’t come to work since last Friday. he have had an accident?

A. Must

B. Could

C. Should

D. Might

答案：

A. Must

(答案→)B. Could

C. Should

D. Might

解析：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