-Do you know ________?-Yes．She is doing her homework．A.what is your sister doingB.what your sister is doingC.when your sister is doing homeworkD.where is your sister doing homework
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B解析考查点：考查宾语从句以及句意。解题思路：宾语从句用陈述句语序，根据答句：是的，她正在做作业，可知问句句意：你知道你的姐姐正在干什么吗？故选B。