【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】

試題分析：考查非謂語動詞。句意：如果被要求為他人照看包裹，請立即通知警察。主句為祈使句，省略了主語you，根據(jù)語境可知，you與ask之間為動賓關系，故選A項。

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