初中英语（介词）____the age of fifteen ,she had written scores of ar

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初中英语（介词）
____the age of fifteen ,she had written scores of articles for a newspaper.
A.At
B.Before
C.since
D.By
解释最好能简明点
我已经知道有At the age of 但是其他的有没有我不知道

选D 意思是到她15岁的时候,她已经为一份报纸写了很多文章了
A是在她15岁的时候,是一个时间点,与后面had不符
B是在她15岁以前,是一个时间段,可以跟had,但后面有更合适的答案,所以不选
C是自从她15岁开始,是一个时间段,可以跟had,但后面有更合适的答案,所以不选

初中英语（介词）____the age of fifteen ,she had written scores of ar ___the age of fifteen,she had written scores of articles for She had written the book by the end of 1960.(对written the bo she died__the age of 52 scores of常用吗 married to/with怎么用 She had written a number of books ___ the dozens of=scores of She paid $80____the pair of shoes. Scores of的意思是 scores of的中文是什么 She came to China____the age of five ____the advances of the science,the discomforts of old age w