It was strange that she should have gone away without saying good_英语解答

It was strange that she should have gone away without saying good-bye.
求解释为什么要用should have gone?

人气：150 ℃　时间：2019-10-14 04:44:17

解答

should have 本应该.
我的理解是：
她本应该不辞而别,但是很奇怪她没有这么做.