三尖瓣闭锁的超声所见特点是
A．左室增大B．肺动脉增宽C．右房室口处有肌性隔膜 D．三尖瓣二尖瓣化 E．左室变小
参考答案：C
He hurried to the booking office only _____ that all the tickets had been sold out. [ ]
A.to find
B.found
C.finding
D.find
