【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(shí)。句意：到他4歲的時(shí)候，他已經(jīng)學(xué)會(huì)了100個(gè)英語單詞。by the time引導(dǎo)的時(shí)間狀語從句，從句過去時(shí)，主句用過去完成時(shí)。故D選項(xiàng)正確。

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