题目内容
6．I don't know ________ she could finish the work by the end of this month．（ ）| A． | whether | B． | what | C． | when |
分析 我不知道她是否能在这个月末完成这项工作．
解答 whether，是否；what，什么；when，什么时候；根据she could finish the work by the end of this month可知，从句中即不缺少时间状语也不缺少宾语，所以排除B、C；故选A．
点评 区分疑问代词需要对句意作出正确判断，还要熟练掌握疑问代词的意义及区别．
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