题目内容
17．I didn't know _______（ ）| A． | where did he use to live | B． | where did he use to living | ||
| C． | where he used to live | D． | where he used to living |
分析 我不知道他曾经住在哪里．
解答 答案：C．
根据I didn't know？再结合选项，可知I didn't know 后面是跟一个宾语从句，宾语从句中应该用陈述语序，即主语+谓语，所以排除AB．短语used to do sth过去常常做某事，to后面跟动词原形．故选：C．
点评 主要考查宾语从句，一定要注意宾语从句的引导词，以及宾语从句的时态和语序问题．把握好这几点，是做好此类题目的关键！
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