Scientists didn‘t know much about lung cancer _ .

时间:2022-06-08 13:41来源:未知作者:admin 点击: 次

22. Scientists didn‘t know much about lung cancer _ . A. before long B. until recently C. long before D. in the past few years

22. Scientists didn‘t know much about lung cancer _ .

A. before long

B. until recently

C. long before

D. in the past few years

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