题目内容
9．They did all the work bythemselves（他们自己）．分析 他们自己完成了所有的工作．
解答 答案：themselves．by oneself是一个固定结构，意思是"由某人自己"根据主语是"They"以及后面的"by_____"结合给出的汉语提示"他们自己"所以要用复数themselves，故填themselves．
点评 首先要掌握固定结构"by oneself"，然后结合具体的语句以及给出的汉语提示，就可以确定正确答案．
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