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【题目】DNA is very useful for us, it many years ago.

A. discovers

B. discovered

C. is discovered

D. was discovered

【答案】D

【解析】

试题分析:句意:DNA对于我们来说是有用的,许多年之前它就被发现了。根据时间状语many years ago.可知用一般过去时态的被动语态,其结构是was/were done的形式。结合语境,故选D。

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