If _____ to look after luggage for someone else, inform the police at once.
A. askedB. to askC. askingD. having asked
A
【解析】
句意为:如果有人要你照看一下行李,立即找警察帮忙。主句inform the police at once=You can inform the police at once. 隐含了一个主语you。If 状语从句中ask与主句主语you含着逻辑被动关系,所以用过去分词asked.
【考点定位】非谓语动词的考查。不定式作状语表目的/结果/原因等。如 We all jumped with great joy to hear the news that our country would have joined WTO by the end of the year.使用现在分词作状语时,分词动作的执行者必须是句子的主语。如Whistling the merry tune, Jack fixed the tire. 过去分词作状语,用来说明谓语动作发生的背景或情况(有时分词动作的受施者是句子的主语。) Looked at in this way, the situation doesn’t seem so disappointing...
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