.--- Who would you like ______ to the ball with?

---Of course Mary. We’ll start at 6:30 and try to get there before 7:00.

A．to go

B．going

C．gone

D．to have gone

诊断肺栓塞最可靠的直接征象是

A．一侧肺透亮度增高
B．肺的外围以胸膜为基底的楔状致密影
C．实变区内小透亮区
D．增强扫描肺动脉主干内充盈缺损
E．局限性肺血管稀少