【題目】I______900 English words by the time I was ten.

A.learned B.was learning

C.had learned D.have learned

【答案】C

【解析】

試題分析：句意：到十歲時，我已經(jīng)學了900多個英語單詞。由by the time 引導時間狀語從句，一般情況下從句謂語動詞用一般過去時，而主句謂語動詞用過去完成時。過去完成時的基本結構為“had+動詞的過去分詞”。故選C。

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