(单选题)
If ______ to look after luggage for someone else, you should inform the police at once.
A.asked
B.to ask
C.asking
D.having asked
参考答案:A
参考解析:
考查省略主语和be动词的用法。句意:如果有人让你帮忙照看行李,你应该马上报警。根据inform the police可知,if引导的从句中主语应该是you,ask和其逻辑主语you之间是动宾关系,所以用ask的过去分词形式。完整的句子是“If you are asked to look after luggage for someone else, inform the police at once.”,当状语从句中主语一致,且从句中有be动词,则可以将从句中一致的主语和be动词一并省略。故选A。
知识点:
