—Yourclassroomisreallybrightandclean. —It

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— Your classroom is really bright and clean.

—It _____ after school every day.

A. is cleaned B. cleaned C. was cleaned

解析:动词语态。every day是一般现在时的标志。根据句意，你们教室真的既明亮又干净。每天放学后我们打扫它。此处是被动语态省略了by us。一般现在时被动语态构成：be+动词过去分词。故选A。