how long have the computers been used by you?改为主动

问题描述：

how long have the computers been used by you?改为主动
has the big tree been cut down by him?改为主动
all the informantion has been used for (writting the article) 对括号中内容进行提问
1个回答 分类：英语 2014-12-12

问题解答：

我来补答
how long have you used the computers?(2)has he cut down the big tree?(3)what has all the information used for?
 
 
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