although the cause of cancer ___ ,we do not yet have any pra

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/09 03:10:40

although the cause 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选a,为什么?

这句话是说,尽管癌症的原因已经慢慢被揭示出来,
然而我们还没有什么有效的方式去阻止它的发生.或者说,
尽管癌症的病因正在被一点一点地揭开,但现在我们没有可以预防它的实用方法.
这道题目其实可以用排除法,因为uncover是个及物动词,表示揭示,那么这里说癌症的原因,
显然是被揭示,要用被动,而BCD全部都是主动,
只能用A选项.致癌原因正被揭开,故选进行时的被动语态.

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