By the time I was nine ,I ______hundreds of English words.
A．had learnedB．have learnedC．has been learnedD．had been learned
A

試題分析：句意:到我九歲的時候，我就學會幾百個英語單詞了。by the time 后跟從句，表示到…時候，從句中常用一般過去時，主句用過去完成時。而且I和learn 之間是主動的關(guān)系，不應該用被動語態(tài)，故C、D不對。B選項是現(xiàn)在完成時。故選A。
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