"I'm glad ______ you here in the hotel."               "It's my great pleasure to have you ______ us."

A．meeting, to

B．to have met, with

C．having met, among

D．to meet, of

下列静脉属门静脉系统的是（）。

A.中央静脉

B.肠系膜上静脉

C.肠系膜下静脉

D.直肠上静脉

E.直肠下静脉