单选题 As a skilled technician, Mr. Butler has comprehensive ______ of the computer software programs.
  • A. opinion
  • B. knowledge
  • C. ability
  • D. collector
【正确答案】 B
【答案解析】[解析] 词汇:名词 1.这是一道词汇选择题,选项均为名词。 2.comprehensive knowledge意为“广泛的知识”,因此B为正确选项。