If _______ to look after luggage for someone else, inform the police at once.
A．a(chǎn)skedB．to askC．a(chǎn)skingD．having asked
A

試題分析:考查非謂語動(dòng)詞。由結(jié)構(gòu)分析可知前面部分是分詞做狀語，ask和句子主語之間是被動(dòng)關(guān)系，所以用過去分詞，此處也可以看做是狀語從句if you are asked to look after luggage的省略。句意：如果有人讓你照看行李，要立刻通知警察。
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