If _______ to look after luggage for someone else, inform the police at onceA.askedB.to askC.askingD.having asked
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A解析试题分析:考查非谓语动词。由结构分析可知前面部分是分词做状语，ask和句子主语之间是被动关系，所以用过去分词，此处也可以看做是状语从句if you are asked to look after luggage的省略。句意：如果有人让你照看行李，要立刻通知警察。考点：考查非谓语动词。