时态转换是否正确We had learned (learn) about 800 words by the end of this year .
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![时态转换是否正确We had learned (learn) about 800 words by the end of this year .](/uploads/image/z/7665401-65-1.jpg?t=%E6%97%B6%E6%80%81%E8%BD%AC%E6%8D%A2%E6%98%AF%E5%90%A6%E6%AD%A3%E7%A1%AEWe+had+learned+%28learn%29+about+800+words+by+the+end+of+this+year+.)
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