题目内容
18．---________ does his sister do online shopping？---I'm not sure．Maybe twice a week．（ ）
| A． | How long | B． | How often | C． | How soon | D． | How many times |
分析 ---他的姐姐多久网购一次？
---我不确定．或许一周两次．
解答 答案：B 联系上下文语境，根据答语twice a week可知，这是频率短语，此处是就频率短语提问．又知How long意为多久，答语为时间段；How often意为多久一次，答语是频率副词或短语；How soon意为多久之后，答语为in+一段时间；How many times意为多少次，答语是数量．所以此处应用How often，故选B．
点评 此题考查频度疑问词的用法．做题时，先联系上下文语境，确定答语的形式，再分析各选项的用法，最终得出准确答案．
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