题目内容

Although the causes of cancer_____, we do not yet have any practical way to prevent it.
A．are being uncoveredB．have been uncoveringC．are uncoveringD．have uncovered
A
因为句子的主语the causes of cancer与谓语uncover 是被动关系，因此我们使用被动结构，只有A 符合这一条件。
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