GWD7-3请各位帮忙，谢谢！

The state has proposed new rules that would set minimum staffing levels for nurses, rules intended to ensure that at least one nurse is assigned for every four patients put through triage in a hospital emergency room.

1. rules intended to ensure that at least one nurse is assigned for every four patients put through triage in a hospital emergency room

2. rules with the intent of ensuring one nurse at least to be assigned for every four patients to be put through triage in a hospital emergency room

3. rules intending to ensure at least one nurse is assigned for every four patients in a hospital emergency room put through triage

4. with the intent of ensuring that at least one nurse should be assigned for every four patients in a hospital emergency room that are put through triage

5. and this is intended to ensure one nurse at least to be assigned for every four patients put through triage in a hospital emergency room

答案：A。为什么不能选E？选A为什么？

谢谢！

1. this /that/these/those不能单独做主语

2.再这里 this 指代rules 数不一致,应该是these,

3.这句话解释rules 不能与第一句话成并列关系.逻辑关系不合理.

4. ensure后能接that 从句和动名词.不能接不定式