red-handed adj.染血的习惯用语be caught [taken] red-handed 被当场捉住when 等引导的状语从句,如果主语与主句的主语一致谓语动词又含 be 动词时,主语和 be 动词常常被省略,就变成“ when + V-ing/ V-ed/ adj/ 介词...