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30. All employees are to refrain from using the elevators, and to move to the designed emergency exits in the event that the alarm _______.
(A) be rung
(B) rings
(C) ringing
(D) to ring


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 【站僕】摩檸Morning:有沒有達人來解釋一下?
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30. All employees are to refrain from..-阿摩線上測驗