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By the 6th century BC， athletes began to specialize（）particular sports， and even began to hire coaches.
By the 6th century BC， athletes began to specialize（）particular sports， and even began to hire coaches.
A.for
B.at
C.in
D.onto
正确答案：in
标签：
新融合大学英语
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What type of words is the suffix “-en” generally added to？
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