问题
选择题
----You look pale and upset.
----Yes, my girl friend _____ an online chat with me non-stop until six o’clock this morning.
A．have been having
B．had had
C．was having
D．am having
答案
答案：C
until six o’clock this morning是一个过去的时间状语, 故用过去进行时表示过去持续的动作。注意A项的干扰作用。