【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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（ ）是指企业公关人员直接参与或举办各种社会性、公益性、赞助性的活动来扩大企业的社会影响，提高其社会声誉，赢得公众的信任和支持。
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交际性公关企划策略
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