be up to sb
是(某人)的職責
http://dictionary.cambridge.org/zht/%E8%A9%9E%E5%85%B8/%E8%8B%B1%E8%AA%9E-%E6%BC%A2%E8%AA%9E-%E7%B9%81%E9%AB%94/up-to?q=Up+to
72.Who is it up _______ decide whether t..-阿摩線上測驗