Although the causes of cancer ____we do not yet have any pra

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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

答案A 考查被动语态.选项A是现在进行时的被动；选项B是现在完成进行时的主动语态；选项C是现在进行时的主动语态；选项D是现在完成时的主动语态.根据题意：虽然癌症的成因长在被揭示,但我们眼下还没有防止它的实用方法.故答案为A.查看原帖

Although the causes of cancer ____we do not yet have any pra Although the causes of cancer ___,we do not yet have any pra although the cause of cancer ___ ,we do not yet have any pra 英语高考28.Although the causes of cancer ____,we do not yet have 英语翻译Causes of cancer in the world:comparative risk assessmen all do not have any at the Do you think our life is full of causes of cancer?why? i have not had any change yet Unfortunately we do not have an account with any of the Cour Do not have the burden of I do not think any is left与I do not think any of them have s Smoking causes mouth cancer