—Can you tell me what time the flight to Detroit leaves?

—I’m sorry, but it _______________.

A．has been canceled

B．had been canceled

C．has canceled

D．had canceled

女性患者，32岁，一周来出现左下后牙对冷热刺激敏感。检查发现左下第一磨牙面深龋洞，探诊洞底感酸痛，冷测反应一过性敏感，叩痛（-）。牙龈无异常。

该患牙的诊断是（）

A.深龋

B.可复性牙髓炎

C.急性牙髓炎

D.慢性牙髓炎

E.牙髓钙化