A. | learned | B. | learn | C. | have learned | D. | had learned |
分析 翻譯:到公元前21世紀(jì)末,中國(guó)農(nóng)民學(xué)會(huì)了如何種植水稻.
解答 答案:D. 句中有by the end of 21st century B.C.(到公元前21世紀(jì)末),指的是截止到這個(gè)過(guò)去的時(shí)間,在這個(gè)過(guò)去的時(shí)間之前,中國(guó)農(nóng)民就學(xué)會(huì)了如何種植水稻,表示過(guò)去的過(guò)去,所以用過(guò)去完成時(shí),過(guò)去完成時(shí)的構(gòu)成:主語(yǔ)+had+動(dòng)詞的過(guò)去分詞,故選D.
點(diǎn)評(píng) 本題考查的是過(guò)去完成時(shí),表示過(guò)去某一動(dòng)作之前已經(jīng)發(fā)生或完成的動(dòng)作.
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