When the plane arrived, some of the detectives were waiting inside the main building中

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• inside the building和in the building意思一样吗?when the plane arrived,some of the detectives were waiting inside the main building,while others were waiting on the airfield.some of the detectives were waiting inside the main building可以改成:some of the detectives were waiting in the main building.
• When the plane arrived,some of the detectives were waiting inside the main building while .后面用个some detectives可以不?后面用whi
• When the plane arrived, some of the detectives were waiting inside the main building中
• When the plane arrived,some of the detectives were waiting inside the main building while others were waiting on the air
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• 已知a、b互为相反数，c、d互为倒数，m=-3，代数式2（a+b）-3cd+m的值为_．