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【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:如果被要求给别人照看行李,立刻通知警方。 从语境中可知这里是被要求,当从句中的主语和主句主语一致时,且从句中有谓语动词,此时可以省略从句中的主语和谓语动词。此句中,主句为祈使句,主语为you,从句中省略了you are。故选A。

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