What ____ Annie ____ by the time she was ten?A. was; learningB. did; learnC. has; learnedD. had; learned请说明原因(详细解释下by在这里是什么意思,表示的什么时态)
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![What ____ Annie ____ by the time she was ten?A. was; learningB. did; learnC. has; learnedD. had; learned请说明原因(详细解释下by在这里是什么意思,表示的什么时态)](/uploads/image/z/10553645-29-5.jpg?t=What+____+Annie+____+by+the+time+she+was+ten%3FA.+was%3B+learningB.+did%3B+learnC.+has%3B+learnedD.+had%3B+learned%E8%AF%B7%E8%AF%B4%E6%98%8E%E5%8E%9F%E5%9B%A0%28%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A%E4%B8%8Bby%E5%9C%A8%E8%BF%99%E9%87%8C%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%2C%E8%A1%A8%E7%A4%BA%E7%9A%84%E4%BB%80%E4%B9%88%E6%97%B6%E6%80%81%29)
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