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问题详情：Forthesafetyofallthepassengers，objectslikeguns，knivesorfireworks        becarriedontotrains，planesorcoaches．A.may                B.needn't            C.should...

问题详情： Forthesafetyofallthepassengers，objectslikeguns，knivesorfireworks        becarriedontotrains，planesorcoaches．A.may                B.needn't            C.shoul...