单选题 If_______to look after luggage for someone else, inform the police at once.

【正确答案】 A

【答案解析】考查非谓语动词。句意：如果你被请求为其他人照看行李，请立刻告诉警察。if引导的条件状语中省略了you are。完整的句式是：If you are asked to look after luggage，故选A项。