【单选题】【消耗次数：1】
All the mobile phones must______ before the meeting starts.
①
be turning off
②
turn off
③
be turn off
④
be turned off
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随机题目
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关于桂枝茯苓丸叙述错误的是（）。
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功能活血，化瘀，消癥
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孕妇慎用
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经期及经后3天禁用
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主治妇人素有癥块，或血瘀经闭
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药物组成为桂枝、桃仁、牡丹皮、白芍、茯苓