2 虚拟语气的含义
虚拟语气往往表达和事实相反的概念。毫无疑问，熟练掌握虚拟语气的句法结构有助于推测说话者的言外之意。
Example
You will hear：
Man：Iagree with your proposal at the meeting this morning.It was a good one.
Woman：You should have backed me up then—when Ineeded it.
Question：What does the woman mean？(https://www.daowen.com)
You will read：
A.Her back hurt during the meeting.
B.She agreed that it was a good meeting.
C.The proposal should be sent back.
D.He didn’t give his support at the meeting.
虚拟结构 should have 表达“本应做的事情却没有做”的概念。You should have backed me up then，说明男士虽同意女士的提议却并未在会议上支持她，正确答案应为D项。