题目内容：

Tom has been absent for two days .Do you know what to him?
Tom has been absent for two days .Do you know what to him?
A has happened B.would happen C.was happedned D.had happened

优质解答

A happen不能用被动,故不能选C,B表示过去将来,不符合； D过去完成时表示过去的过去；A现在完成时,表示过去发生对现在的影响.