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The police's advice was that no one ____________ his luggage unattended at the airport.
A、 leaves
B、 left
C、 leave
D、 will leave
【正确答案】：C
【题目解析】：该题考查的是虚拟式的用法。主句动词出现advice, suggest, demand等表示要求、建议等意时，后面的that从句中动词为-be型虚拟式，即should+动词原形，should可以省略，因此选C。