问题详情:
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
【回答】
A知识点:现在进行时及其被动式
题型:选择题
问题详情:
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
【回答】
A知识点:现在进行时及其被动式
题型:选择题