【題目】 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：如果有人要你為別人照看行李，立刻報(bào)告警察。句子的主語(yǔ)為you，與ask為被動(dòng)關(guān)系，用過(guò)去分詞，If asked...= If you are asked...。

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