You can't do your exercisespencil,you must do ita pen

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/18 01:28:30

You can't do your exercises__pencil,you must do it__a pen

in with
再问：原因
再答：介词in表示方式，后跟宾语的pencil是表明这种用具，是泛指意义，不能用冠词限定；而介词with表示“用”，后面要出现具体的物品，pen是可数名词，用a加以限定，指的是钢笔这类事物中不确定的一个。

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