作业帮___the age of fifteen,she had written scores of articles for a newspaper.__中填at还是by,
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___the age of fifteen,she had written scores of articles for a newspaper.__中填at还是by,
___the age of fifteen,she had written scores of articles for a newspaper.__中填at还是by,
___the age of fifteen,she had written scores of articles for a newspaper.__中填at还是by,
by,因为后面用的是完成时,用at则构成过去的时间状语,我i应该用一般过去时
at 在几岁的时候，用at
by
at the age of fifteen,she had written scores of articles for a newspaper.
十五岁时，她为报纸写了几十篇文章。
at
[英][ət][美][æt,ət]
prep.（表示位置）在; 在（某时间或时刻）; 以，达; 向，朝;
n.阿特（老挝辅币单位，100...
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at the age of fifteen,she had written scores of articles for a newspaper.
十五岁时，她为报纸写了几十篇文章。
at
[英][ət][美][æt,ət]
prep.（表示位置）在; 在（某时间或时刻）; 以，达; 向，朝;
n.阿特（老挝辅币单位，100 阿特 = 1 基普）;
by
[英][baɪ][美][baɪ]
prep.靠，通过; 被，由; 沿着; 按照;
adv.经过，过去; 在侧，在附近; 短暂拜访;
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___the age of fifteen,she had written scores of articles for a newspaper.__中填at还是by,
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___the age of fifteen,she had written scores of articles for a magazine A.At B.Before C.Since D.By
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