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【题目】By the time he was 4 years old, he ________ 100 English words.

A. learns B. will have learned C. has learned D. had learned

【答案】D

【解析】

考查过去完成时。句意:到他4岁的时候,他已经学会了100个英语单词。by the time引导的时间状语从句,从句过去时,主句用过去完成时D选项正确。

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