we come to the lidrary ( twice )a week.对括号提问

问题描述:

we come to the lidrary ( twice )a week.对括号提问

How often do you come to the library a week?
twice是频率,对频率提问用How often
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用How often 表频率
How often do you come to the library a week ?

表示频率是How often
所以是:
How often do you come to the library a week?