题目内容
15、 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
试题答案
15、解析：
A．时态，语态。癌症的原因是被发现，必须用被动语态。
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
查看习题详情和答案>>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
查看习题详情和答案>>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
查看习题详情和答案>> 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
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 |
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 |
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
查看习题详情和答案>>
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
查看习题详情和答案>>