scientists didn't know much about lung cancer——.

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scientists didn't know much about lung cancer——.
A before long B until recently C long before D in the past few years

C long before 很久以前
A before long 不久后,肯定错了.
B until recently 直到最近,是和现在有关,不能用过去时didn't
D in the past few years 最近几年,理由同上.

scientists didn't know much about lung cancer——. Scientists didn’t know much about lung cancer _____. people didn't know much about the sun or the we didn't know much about each other twenty years ago.we wer 英语作业帮帮我!翻译下列句子!1.Although I didn't know much about training he didn’t know much about the harmful effects on smoking,为什么 lung cancer是什么意思选择He didn't know ( )about it They don't know scientists,any more than they know much abou 翻译 As is know to all,lung cancer is at least in part caused smoking can reason lung cancer She didn't know about this bad news a bit.She didn't know ab