This flu season in the U．S. began earlier than usual and started ________ in midNovember with an increase of inf

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1. (2020·南京模拟) This flu season in the U．S. began earlier than usual and started ________ in midNovember with an increase of influenza B.

A . building up B . piling up C . rising up D . picking up

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备考2021年高考英语一轮复习10：动词短语