By the time I was nine ,I ______hundreds of English words.

A．had learnedB．have learnedC．has been learnedD．had been learned

A

解析試題分析：句意:到我九歲的時(shí)候，我就學(xué)會(huì)幾百個(gè)英語單詞了。by the time 后跟從句，表示到…時(shí)候，從句中常用一般過去時(shí)，主句用過去完成時(shí)。而且I和learn 之間是主動(dòng)的關(guān)系，不應(yīng)該用被動(dòng)語態(tài)，故C、D不對(duì)。B選項(xiàng)是現(xiàn)在完成時(shí)。故選A。
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)。

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