组卷网 > 初中英语综合库 > 语法 > 谓语动词的时态 > 现在进行时 > 表示正在进行的动作
题型:单项选择 难度:0.85 引用次数:176 题号:22631342
The students of Class Two ________ a science experiment in the lab right now.
A.doB.didC.are doingD.have done

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