The businessman regretted having spent so much time traveling when he ______ with his family.
A、should have staved
B、had stayed
C、was to stay
D、must stay
【正确答案】：A
【题目解析】：译文：这个商人为自己花了太多的时间来旅行而感到后悔，他本该多花点时间陪他的家人。此題考查虚拟语气。由regretted可知，是对过去的虚拟,从句中用should have done表示本该做（但实际没做）...。答案为A。
