单选题 You should attempt to correct problems with your work computer ______ an IT expert cannot be reached for assistance in a timely fashion.
  • (A) only if
  • (B) so as
  • (C) rather than
  • (D) in order that


【正确答案】 A
【答案解析】[语法] 表条件连词only if(只是在……的时候)