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    精英家教网 > 高中英语 > 题目详情
    　　Be careful when________ the homework.

    　　A．doing

    　　B．do

    　　C．you doing

    　　D．you did

     

    答案：A
    解析：

    		　　when／while doing sth. ，sb. …此句型中。前后主语一致。

     


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