组卷网 > 高中英语综合库 > 语法 > 词法 > 非谓语动词 > 动词的固定结构
题型:单项选择 难度:0.65 引用次数:100 题号:19129725
We passed by the classroom and saw the teacher ______ the experiment.
A.makeB.makingC.madeD.to make

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