题目内容
16．-Do you know ______？-Yes．She is doing her homework．（ ）| A． | what is your sister doing | |
| B． | what your sister is doing | |
| C． | when your sister is doing homework | |
| D． | where is your sister doing homework |
分析 --你知道你妹妹正在干什么吗？--她正在做作业．
解答 答案：B 根据Do you know ______？再结合选项，可知Do you know ______？后面是一个宾语从句，宾语从句中应该用陈述语序，即主语+谓语，所以排除A，D．再根据答语She is doing her homework．可知上文是问在干什么？所以引导词应该是what，故排除C．故选：B．
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！就本题而言主要考查宾语从句的引导词和语序．
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