问题
选择题
—I hear Robert has gone to Harvard University for his masters degree.
—Oh,how nice!Do you know when he ?
A．was leaving
B．left
C．had left
D．has left
答案
答案：B
由上下文可知此处when暗含一个过去时间，故应用一般过去时态。
搜题请搜索小程序“爱下问搜题”