Scientists didn’t know much about lung cancer _____.1.before long 2.until recently 3.long before 4.in the past few years

1t等于多少kn didn't scientists didn't know much about lung cancer——.A before long B until recently C long before D in the past few years Scientists didn’t know much about lung cancer _____.1.before long 2.until recently 3.long before 4.in the past few years Scientists didn’t know much about lung cancer _____.1.before long 2.until recently 3.long before 4.in the past few years Animal thinking.For a long time,scientists didn't study animal thinking.Most of them didn't believe that animals could think.They thought humans were the only thinking animals.Now more scientists are studying this subject.But it's very hard to prove 换算题1t=?KN 1t=?kn 谢谢 急用 didn't went还是didn't go A. Putting direct speech into indirect speech:21. Putting direct speech into indirect speech:(1) Scientists say, “The earth moves round the sun.” (2) The teacher asked me, “Have you finished your work yet?:” (3) “Why didn’t you come School education is very important and useful.The students not only learn language but also get an education.Yet,n______ can learn everything from school.Great scientists such as Edison,Newton,Galileo and Einstein,didn't learn everything from school i didn't want didn't的过去式 I didn’t know why didn't i didn't see didn't什么意思? didn't什么意思