题目内容
20．-_________ is your mother's birthday？--Sorry，I don't know．（ ）| A． | What | B． | When | C． | Where | D． | Who |
分析 -你妈妈生日是什么时候？-不好意思，我不知道．
解答 正确答案：B．what询问内容，表示什么，when询问时间，表示什么时候，where询问地点，表示哪里，who询问人，表示谁．根据题干可知说话人在询问其妈妈生日是什么时候，是对时间进行提问，故选择B．
点评 本题考查疑问词，基础题，熟悉常用疑问词的含义及用法，再根据题干进行选择．
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