Question

【题目】

If ______ to look after luggage for someone else, inform the police at once.

A. asked

B. to ask

C. asking

D. having asked

Answer 1

【答案】A

【解析】句意: 如果有人让你踢他照看行李，请立刻告知警察。后面的主句是祈使句，句首省略了you，主语you和ask存在被动关系；从句的if后面省略了you are。