求助帖 that 为什么可以做non-essential modifier

Hxmemma

The new “e-waste” salvage company collects electronic waste items, such as old cellular telephones and broken personal music players, discarding them as trash, to transport them to state facilities for recycling.

		players, discarding them as trash, to transport
		players, that have been discarded as trash and transports
		players that are discarded, as trash in order to transport
		players, which have been discarded as trash and transport
		players, that are discarded as trash and transport

曼哈顿模考题目  答案我实在不能理解  求大N指教   还有这道题的解题过程和思路也求NN 来解答

Hxmemma

The health commissioner said that the government had implemented strict measures to eradicate the contaminated food and, despite the recent illnesses, it will try to prevent the outbreak from recurring in the future.

       
it will try

       
that it tried

       
it had tried

       
it would have tried

       
that it would try
HIDE EXPLANATION


同类型  that 前面可以加“，”的时候  只有当前面是插入语的时候  插入语将主从句分开了  如“despite the recent illnesses,”和 “上文such as 那句话”

Hxmemma

但是不太理解为什么是have been ?  B D E 中怎么删选呢