86.If______to look after luggage for someone else, think twice.
答案解析
解析：
分析句子结构可知,逗号后为省略第二人称主语 you 的祈使句,且you 与ask 之间是逻辑上的动宾关系,所以空处应用过去分词,表示被动。过去分词前加引导词丘是为了强调其作条件状语。另外,也可将逗号前看作引导的条件状语从句,其完整形式为 I you are asked to look after luggage for someone else,这里省略了和主句相同的主语 you 和be动词are。故选 A。
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