【lungcancer】...didn'tknowmuchaboutlungcancer——.A...

发布时间：2021-04-03 09:01:59

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

网友回答

【答案】 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.
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