—Yourclassroomisreallybrightandclean. —It

— Your classroom is really bright and clean.

—It _____ after school every day.

A. is cleaned B. cleaned C. was cleaned

解析:動詞語態。every day是一般現在時的標誌。根據句意，你們教室真的既明亮又幹淨。每天放學後我們打掃它。此處是被動語態省略了by us。一般現在時被動語態構成：be+動詞過去分詞。故選A。