Article looked up by you is nonexistent什么意思?

Article looked up by you is nonexistent什么意思? article by article 1.His disappearance(失踪)______ by the police.A.looked at B.will be looked in C.is being looke1.His disappearance(失踪)______ by the police.A.looked at B.will be looked in C.is being looked into D.has been looked up答案是C为什么不选A啊? looked for ,looked up ,looked at,looked out of的区别与用法, Sam picked up some knoeledge of the computer just by watching others working on it 这里为什么要选D选项有：A:brought up B:looked up C:set up D:picked up 1、She has always ( ) her father.A.Looked up B.looked at C.looked over D.looked upon2、There are many ( )sites that mark the progress of human society.A.history B.historical C.lively D.alive3、It takes a long time to go there by train,it's ( ) by article What's his silence for?Today I have seen an article written by a middle school student.The title of the article is 'The more growing up,the more regret',just like a song sung by S.H.E ' Don't wanna to grow up' .From which I have seen his own mind,he .When I came into the house,the boy there looked 20.When I came into the house,the boy there looked 20A me ______ surprise.A.at; in B.for; to D.by; for D.up; over help me translate thisIn the run-up to the event,it looked as if this might be overshadowed by squabbles over America’s internet hegemony suddyenly a window opend and a small man______.A)looked at B)looked up C)looked out D)looked for she looked up the word 这里的UP是什么词 Sam picked up some knoeledge of the computer just by eatching others working on it 这里为什么要选D选项有：A:brought up B:looked up C:set up D:picked upSam picked up some knoeledge of the computer just by watching others working on it 这 the article by JACK是指作者是JACK吗? My teacher _____my maths homework.(looked up looked at)请问选哪一个 为什么? looked up to see the sky seemed to see you Cry when looked up, facing the sun smile 是什么意思? One midnight,a little girl woke up to get water.She got up and down her beOne midnight,a little girl woke up to pass water.She by herself got up and down her bed,walked to the bedroom door and opened it.She looked outside and walked back,for it was s