选A .mustn't 一定不要.全句意思：当空调开着时你一定不要开门.mustn't 表示禁止.所以本句选它.
needn't表示不必要
won't 将来会
couldn't表示过去不会或不能
you _leave the door open as the air-conditioner is working
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相关问题
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( )Please ___the door open.The air in the room is not good.A
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why did you leave the door a,opening b,
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pleas remember( )(open)the door when you leave here
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Leaving the burn open to the air is the quickest way to heal
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( )there is an air conditioner _ the window
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There is _____________ air-conditioner on the wall. [ &
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It is suggested that the air conditioner __________________
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There is an air conditioner ________ the window．
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don't leave the door open 为什么用leave
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___ ,the workers continued their work in the open air.