The Pentagon has not released details of the damage the vessel incurred nor how long it might be out of action in a region which, with the rise of the Chinese navy, is seeing growing demands on the US fleet.
Which leaves US military planners with some big questions to answer in the coming weeks and months.
Not the least of which is, how did this happen?
请问,这是定语从句吗?这三个which的先行词都是什么?