The businessman regretted having spent so much time traveling when he（ ）with his family.
A、
should have stayed
B、
had stayed
C、
was to stay
D、
must stay
【正确答案】：A
【题目解析】：
根据句意“他后悔花了那么多时间旅行”，所以是本该和家里人在一起却没有在一起，should have done，选A。句意：这位商人后悔花了那么多时间旅行，而他本来应该和家人呆在一起。