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

当归补血汤主治证候中可见

A．寒热往来

B．夜热早凉

C．身热不扬

D．憎寒壮热

E．肌热面赤