【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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①
didn’t
②
not did
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④
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随机题目
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借贷双方金额必须相等
②
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①
现金余额说
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费雪方程式
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剑桥方程式
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