10．By the time he was six，the boyhad learnt 3，000English words．（learn）

分析 到他六歲時為止，那個男孩已學了3000英語單詞．

解答 答案：had learnt 考查單詞填空．by the time意為"到…為止"，一般要求主句用過去完成時，謂語動詞用had learnt．

點評 考查單詞填空，準確地理解句意，翻譯句子，然后，根據(jù)句意，寫出正確的單詞．

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