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【题目】I______900 English words by the time I was ten.

A.learned B.was learning

C.had learned D.have learned

【答案】C

【解析】

试题分析:句意:到十岁时,我已经学了900多个英语单词。由by the time 引导时间状语从句,一般情况下从句谓语动词用一般过去时,而主句谓语动词用过去完成时。过去完成时的基本结构为had+动词的过去分词。故选C。

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