题目内容
2．-________do you go to the library？-once a week．（ ）
| A． | How long | B． | How often | C． | How much |
分析 -你多长时间去图书馆一次？
-一周一次．
解答 答案：B；"How long"多长时间"，How often多久一次（对频率进行提问）；How much多少（对不可数数量进行提问）；通过答语，Once a week一周一次"，可以判断本句是问频率的，故选B．
点评 根据语境，细读选项，认真分析选项之间的异同，选择正确的答案．
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