Although the causes of cancer_____, we do not yet have any practical way to prevent it.

A．a(chǎn)re being uncoveredB．have been uncovering
C．a(chǎn)re uncoveringD．have uncovered

A

解析試題分析：考查時(shí)態(tài)。句意：盡管癌癥的原因正在在揭開(kāi)，我們?nèi)匀贿�是沒(méi)有任何實(shí)用的方法來(lái)預(yù)防癌癥。根據(jù)句意說(shuō)明癌癥的原因正在被揭開(kāi)，使用的是現(xiàn)在進(jìn)行時(shí)的被動(dòng)語(yǔ)態(tài)。故A正確。
考點(diǎn)：考查時(shí)態(tài)
點(diǎn)評(píng)：英語(yǔ)中的時(shí)態(tài)主要由動(dòng)詞的形式?jīng)Q定，因此在學(xué)習(xí)英語(yǔ)時(shí)態(tài)時(shí)，要注意分析動(dòng)詞形式及具體語(yǔ)境，想象在那個(gè)特定的時(shí)間動(dòng)作所發(fā)生的背景，這個(gè)動(dòng)作是經(jīng)常性動(dòng)作、一般性動(dòng)作、進(jìn)行性動(dòng)作、完成性動(dòng)作還是將要發(fā)生的動(dòng)作。

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