問題詳情：
His uncle ________ his computer and checked his e-mail.
A. turned on B. turned off ed up D. turned down
【回答】
A 句意：他叔叔打開電腦檢查他的電子郵件。turn on “打開”；turn off “關上”；turn up “將聲音調大”；turn down “將聲音調小”。
知識點：動詞和動詞短語
題型：選擇題
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