【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(shí)，我已經(jīng)學(xué)了900多個(gè)英語(yǔ)單詞。由by the time 引導(dǎo)時(shí)間狀語(yǔ)從句，一般情況下從句謂語(yǔ)動(dòng)詞用一般過去時(shí)，而主句謂語(yǔ)動(dòng)詞用過去完成時(shí)。過去完成時(shí)的基本結(jié)構(gòu)為“had+動(dòng)詞的過去分詞”。故選C。

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