Citizens,when told to repalce their Cokes with milk.翻译下这句话,为什么用told?

题目

Citizens,when told to repalce their Cokes with milk.翻译下这句话,为什么用told?

答案

公民们,当被告知他们,要用牛奶取代可乐,并不同意.
Citizens,(when (they are) told to repalce their Cokes with milk,) don't agree .
括号内是插入语,也就是说,你所给的句子,只有一个主语,没有谓语部分,并不完整.