The Chinese farmers how to grow rice by the end of 21st century B．C．( )A．learnedB．learnC．have learnedD．had learned 题目和参考答案——青夏教育精英家教网—

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10．The Chinese farmers _____ how to grow rice by the end of 21st century B．C．（　　）

A．

learned

B．

learn

C．

have learned

D．

had learned

分析翻译：到公元前21世纪末，中国农民学会了如何种植水稻．

解答答案：D．句中有by the end of 21st century B．C．（到公元前21世纪末），指的是截止到这个过去的时间，在这个过去的时间之前，中国农民就学会了如何种植水稻，表示过去的过去，所以用过去完成时，过去完成时的构成：主语+had+动词的过去分词，故选D．

点评本题考查的是过去完成时，表示过去某一动作之前已经发生或完成的动作．

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