Although the causes of cancer ____, we do not yet have any practical way to prevent it. [ ]A. are being uncovered B. have been uncovering C. are uncovering D-高中英语-n多题

◎ 题干

Although the causes of cancer ____, we do not yet have any practical way to prevent it.

A. are being uncovered
B. have been uncovering
C. are uncovering
D. have uncovered

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◎ 解析

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◎ 知识点

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◎ 相似题

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