问题标题:
【英语高考28.Althoughthecausesofcancer____,wedonotyethaveanypracticalwaytopreventit.28.Althoughthecausesofcancer____,wedonotyethaveanypracticalwaytopreventit.A.arebeinguncoveredB.havebeenuncoveringC.areuncoverin】
问题描述:
英语高考28.Althoughthecausesofcancer____,wedonotyethaveanypracticalwaytopreventit.
28.Althoughthecausesofcancer____,wedonotyethaveanypracticalwaytopreventit.
A.arebeinguncoveredB.havebeenuncovering
C.areuncoveringD.haveuncovered
如果选项E是havebeenuncovered,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.
郭永鑫回答:
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
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