题目内容
【题目】-___________ did they go to the library when they were in the USA?
- Once a week.
A.How
B.When
C.How often
【答案】C
【解析】）根据题意可知是询问事情发生的频率，How often：多久？故选C。
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题目内容
【题目】-___________ did they go to the library when they were in the USA?
- Once a week.
A.How
B.When
C.How often
【答案】C
【解析】）根据题意可知是询问事情发生的频率，How often：多久？故选C。