—I’d like to invite you to my birthday party this evening.

—Thanks, but ____ I’ll have time I’m not sure at the moment.

A．while

B．whether

C．if

D．when

患者，女，25岁。左下后牙吃食物不适就诊。检查见左下第一磨牙面深龋洞，探软、冷刺激进洞后敏感，食物嵌塞痛，冷热试验同对照牙。该患牙诊断可能为（）

A.浅龋

B.中龋

C.深龋

D.牙髓充血

E.慢性牙髓炎