【題目】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】

考查過去完成時。句意：到他4歲的時候，他已經(jīng)學會了100個英語單詞。by the time引導的時間狀語從句，從句過去時，主句用過去完成時。故D選項正確。

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