英语高考28.Although the causes of cancer ____,we do not yet have

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英语高考28.Although the causes of cancer ____,we do not yet have any practical way to prevent it.
28.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
如果选项E是have been uncovered,那是选E还是A?,还是EA都行?
如何知道语义是正在被发现还是已经被发现?
要详解.

虽然导致癌症的原因已经被发现了,我们却还没有可行的方法预防它.
a. 正在被发现

英语高考28.Although the causes of cancer ____,we do not yet have 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 英语翻译Causes of cancer in the world:comparative risk assessmen Have you ____(water) the plants? -Not ,yet,I ___ (do) it in you have not read the ____ for the machine yet? WHY WE DO NOT HAVE THE RIGHT OF FREE SPEAKING! Do you think our life is full of causes of cancer?why? we are not out of the woods yet . the main difficulty is that we do not have enough ____(exper 英语翻译Although we do not have data that allow to illustrate th