----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 havingB.had hadC.was havingD.am having
网友回答
C解析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。