题目内容
【题目】─What ___ your sister doing? ( )
─She _____ cleaning the floor.
A. are, is B. does, is C. is, is
【答案】C
【解析】
略
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题目内容
【题目】─What ___ your sister doing? ( )
─She _____ cleaning the floor.
A. are, is B. does, is C. is, is
【答案】C
【解析】
略