- 试题详情及答案解析
- ---___________ do they visit their old friends?
---Once a year.
A How long B How often
C How many times D How much time- 答案：B
- 试题分析：句意：--他们多久去看望一次他们的老朋友？--一年一次。分析选项：how long多长时间；how ofen多久一次；how many times多少次；how much time多少时间。分析答语，一年一次，表示时间频率，因此明确疑问词为how often.故选B
考点：考查疑问词的用法。