—Did you have any trouble with the shopkeeper?

—_____to speak of, in my opinion.[ ]

A. No

B. Neither

C. None

D. Nothing

慢性增生性牙髓炎的特点是()

A．息肉为牙髓息肉

B．息肉为牙龈息肉

C．息肉为牙周膜息肉

D．息肉为牙槽骨息肉

E．以上均不正确