Scientists didn’t know much about lung cancer _____.

时间:2021-02-20 11:45来源:未知作者:admin 点击: 次

(单选题)15: Scientists didn’t know much about lung cancer _____. A: before long B: until recently C: long before D: in the past few years

(单选题)15: 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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