— have you been to Taiwan?— Only once.A. How oftenB. How many timesC. How longD. How soon

问题补充：

— have you been to Taiwan?

— Only once.

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：A. How often多久一次，表示频率；B. How many times 多少次，常和完成时态连用 ；C. How long 多长时间或是距离；D.How soon 多久，一般用于将来时态中；故选B.句意：你去过几次台湾呢？仅有一次。