【題目】By the time he was 4, he ______ a lot of German words.

A. had learnedB. has learnedC. learnedD. learns

【答案】A

【解析】

句意:到他4歲時,他已經(jīng)學(xué)會了很多德語單詞。A是過去完成時;B是現(xiàn)在完成時; C是過去時;D是一般現(xiàn)在時。by the time一般和完成時態(tài)連用,如果其后接現(xiàn)在的時間,主句用現(xiàn)在完成時;如果其后接過去的時間,主句用過去完成時。he was 4是一個過去的時間,故后面的主句用過去完成時態(tài)。故選A

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