【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：
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随机题目
【单选题】
关于职业期望，下列说法错误的是（ ）。
①
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②
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③
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④
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