题目内容：

单选_slip and hurt his leg last week,he has to stay at home.A having slipped
B slipping Cbeing slipped D To slip

优质解答

A,原因状语从句,上周发生的事情对现在造成的影响,故用现在完成时,因主语和动词滑倒是主动关系,所以用主动,因此是 having slipped.