----Do you think we can get there on time?

----Yes，_______ the truck doesn’t break down.

A．even if

B．so long as

C．until

D．unless

呼吸道合胞病毒肺炎最突出的特点为（）

A.喘憋症状显著

B.肺部功能残气量减少

C.鼻翼翕动伴严重发绀

D.肺部广泛湿啰音

E.肺部啰音不明显