---Could I have a window seat ?

---All right. Your flight _____ boarding at Gate 18 at 2:15.

A．have begun

B．began

C． is to begin

D．begins

班氏丝虫病淋巴阻塞性病变期的主要临床表现为

A．鞘膜积液

B．象皮肿

C．乳糜尿

D．继发感染

E．肺嗜酸性粒细胞浸润综合征