—have you visited Nanjing? —Three times.A. How oftenB. How many timesC. How longD. How soo

问题补充：

—have you visited Nanjing? —Three times.

A. How often

B. How many times

C. How long

D. How soon

答案：

A. How often

(答案→)B. How many times

C. How long

D. How soon

解析：three times表示次数，常用how many times来提问。