单选题 They came to the conclusion ______ not all things can be done by automation.
  • A. which
  • B. it
  • C. that
  • D. what
【正确答案】 C
【答案解析】[解析] 本题考查的是同位语从句的引导词。同位语从句一般由that来引导，所以，本题答案为C。