题目内容
9．-Do you know ________ the school？-About twenty minutes ago．（ ）
| A． | when he left | B． | when did he leave | ||
| C． | when he leaves | D． | when does he leave |
分析 --你知道他什么时候离开学校的吗？
--20分钟之前．
解答 答案：A．
根据Do you know可知，本题考查宾语从句，宾语从句中一般为陈述语序，选项BD是疑问语序，所以排除掉；再根据About twenty minutes ago，可知这里表示的是时间，而且是一个过去的时间，所以宾语从句的引导词是when，时态应该用一般过去时．故选A．
点评 本题考查宾语从句，做题时注意三要素时态、语序和引导词．本题先考虑语序问题，再根据句子的上下文的意思，做出选择．
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