题目内容
. If _____ to look after luggage for someone else, inform the police at once.
| A．asked | B．to ask | C．asking | D．having asked |
A
解析试题分析：句意为：如果有人要你替他看管行李，立即联系警察。ask 的主动形式后不能直接跟不定式作宾语，只能跟不定式作宾补，所以可以直接排除 B、C、D 三项。完整的句子应该是If you are asked to look after luggage for someone else,当从句中的主语和主句的主语一致的时候，可以省略从句的主语和be动词，选A。
考点：考查状语从句的省略
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