判断牙龈炎症程度的指标为()

A．观察牙龈颜色

B．牙周附着水平

C．测量龈沟液量

D．探测龈沟深度

E．探诊有无出血

The whole meal was good but the wine____ particular was excellent.       [      ]

A. at            

B. on            

C. in            

D. by