Be careful when the homework. A．doing B．do C．you doing D．you did 题目和参考答案——青夏教育精英家教网—

题目内容

　　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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