—I saw Mr Smith in the office at ten yesterday morning.

—That's impossible. He __________ an English party with us then.[ ]

A. has          

B. had          

C. was having  

D. has had

下列静脉血管中属于门静脉系统的是（）

A.髂内静脉

B.肾静脉

C.脾静脉

D.肝静脉

E.直肠下静脉