单选题 Such occupations were so ______ as to be unworthy of his full attention.
  • A. triggering
  • B. tripling
  • C. trifling
  • D. trembling
【正确答案】 C
【答案解析】[解析] 各项的意思是：triggering“起动，触发，控制”；tripling“三重”；trifling“不重要的”；trembling“发抖的，担心的，战栗的”。