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题文

It’s 8 o’clock. My mother is reading a book. My sister and I _____.

A.is doing my homework B.am doing my homework
C.is doing our homework D.are doing our homework
科目 英语   题型 单选题   难度 较易
知识点: 主语+系动词+表语 时态辨析 比较介词
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