The investigators found that more shouldbe done for ______ i

the investigators discussed the results of their experiment for a long time__.
a.but could not reach a decision that they agreed to
b.without being zble to come to the point where a decision could be made
c.but in vain could they come to a decision which was to be accepted
d.but in vain could they come to a decision which was to be attempted
为什么只能选A其它不行?

高手帮我翻译一下吧!急,在线等
use the Library's InvestiGator Online Catalog to search for materials by Author, Title, Keyword or Subject read a Library call number and find items in the Library identify and use different types of reference sources for finding different types of information understand what print based indexes and abstracts are and how to use them多谢了!

英语翻译
内容是：.(1) Where an investigator has conducted an investigation,the
investigator must,as soon as is reasonably practicable,prepare a written
report relating to the investigation and give the report to the Commission.
(2) The report must include:
(a) the investigator's conclusions from conducting the investigation and
the reasons for those conclusions; and
(b) any recommendations that the investigator wishes to make arising from
the investigation or those conclusions; and
(c) such other matters,if any,as are prescribed.
(3) As soon as is reasonably practicable after receiving the report,the
Commission must:
(a) give a copy of the report,together with any written comments that it
wishes to make,to the employer; and
(b) if it thinks it appropriate,give a copy of the report,together with
those comments (if any),to the responsible Minister in relation to the
employer.
(4) The Commission may,in writing,request the employer to provide to the
Commission,within a reasonable period specified in the request,particulars
of:
(a) any action that is proposed to be taken as a result of the conclusions
or recommendations contained in the report; and
(b) where a notice has been issued under section 46 or 47 in relation to
work being performed for the employer - any action that has been taken,or
that is proposed to be taken,in respect of that notice;
and the employer must comply with the request.
求求各位大虾不要用什么在线翻译，翻译的都是问题句子，很多错误……

根据英语新闻,写一篇英语评论
U.S.investigators suspect that Malaysia
Airlines 3786.KU -2.04% Flight 370 stayed in the air for about four hours past
the time it reached its last confirmed location,according to two people
familiar with the details,raising the possibility that the plane could have
flown on for hundreds of additional miles under conditions that remain murky.
.

原句：Federal investigators are pursuing persons of interests in the United States.
请问：person of interests是什么意思?

谢谢您的鼎力帮助!

英语题,一道英语题 求解
Investigators agreed that passengers on the airliner ____ at the very moment of the crash. 　　
Ashould have died Bmust be dying Cmust have died Dought to die 　　
这题选什么呢 能给解释一下么