Your classroom has been cleaned by the robots.nowtheirs is being cleaned．题目和参考答案——青夏教育精英家教网—

10．Your classroom has been cleaned by the robots，nowtheirs（ they） is being cleaned．

分析你的教室已经被机器人打扫干净了，现在他们的教室正在被打扫．

解答答案：theirs．
根据Your classroom has been cleaned by the robots，now--（ they） is being cleaned，可知你的教室已经被机器人打扫干净了，现在他们的教室正在被打扫，这里根据Your classroom，可推知后面应该说的是他们的教室，这里做主语，应该用名词性物主代词theirs．故填theirs．

点评本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．

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