It is still unclear ____ the little boy got the CD player to work.请问怎么选,考了哪些考点?A.whereB.whatC.thatD.how

It is still unclear ____ the little boy got the CD player to work.请问怎么选,考了哪些考点?A.whereB.whatC.thatD.how stand off是什么意思呀是个名词It is still unclear if Ahmed's take over will end a political stand off with the country's main opposition group It is unclear what force a contract can have for people.what 做什么成分? it is unclear what luring was required,given his compulsive behavior.翻译 it is unclear what luring was required,given his compulsive behavior.翻译 英语翻译1.it is still unclear when the newest type of car will be on sale and how much it will cost.2.but there is no time for him to do it again.3.-i flew to Shenyang for the football match against Oman last week.-is that why you had a few days IT IS STILL YOU怎么样 请问：librarians are testing the waters .请问：librarians are testing the waters to identify what present and future roles they may have in these developments; but these are early days,and it is still unclear what those roles may be.11 sheer industry it is unclear yet how much of it will stand the test of time,but for sheer industry,the business schools deserve credit. AIDS is still out there and it still kills RT 翻译It still is for many It is still a mystery for is it still meaningful to continue? 英语翻译It is unclear what luring was required ,given his compulsive behavior.And in what sense was he wil operative?注：operative该怎么翻? 请英语高手帮我看看这个句子哪里错了It is unclear whether have different between the city and countryside or not the reason for和the reason to的区别另补充一题：The reason he ____ his absence is still unclear to un all.（1）下划线处写for还是to?（2）如何翻译本句?:- ) It's(o )eight o'clock.It is still early I have tired it,but it is still ＿(useful).