题目内容
【题目】 If __________ to look after luggage for someone else, inform the police at once.
A. asked
B. to ask
C. asking
D. having asked
【答案】A
【解析】句意:如果有人要你为别人照看行李,立刻报告警察。句子的主语为you,与ask为被动关系,用过去分词,If asked...= If you are asked...。
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