しかし、アメリカではふつう、スポーツチームは腕｛うで｝で選｛えら｝ばれ,学業｛がくぎょう｝のコースは学力｛がくりょく｝によって選｛えら｝ばれます。
However, in America, sports teams are generally chosen by skill, and academic
courses by ability.
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2019-03-19T15:05:20.820
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2019-03-19T15:40:42.477
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question
grammar
Why is the verb 選ばれる left in its stem form in the middle of this sentence?