【单选题】【消耗次数：1】
Sam, having forgotten to save his work [] lost all of his revisions when his computer crashed.
①
comma
②
dash
③
brackets
④
semicolon
参考答案：
复制
纠错
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【判断题】
<img src=https://huaweicloudobs.ahjxjy.cn/5FECD6D0EF3FD13BB1B2627DF114271C.jpg title=6.jpg alt=6.jpg/>
①
正确
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【判断题】
<img src=https://huaweicloudobs.ahjxjy.cn/27C142E5D5B6E37AC09923F4B390AE09.png title=13.png alt=13.png/>
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正确
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错误