问题
选择题
The two friends ______on the Internet for three hours, and they would go on till the next morning.
A．have been chatting
B．had been chatting
C．were chatting
D．had chatted
答案
答案：A
考察时态。根据后面的for three hours可知是与完成时连用。B项是过去完成时，应该有明显的时间状语，本题没有。根据句意可知A正确。句意：那两个朋友一直在网上聊了3个小时。