单选题 The projected expenses for a new facility can be given only ______ extensive research and necessary calculations are completed.
  • (A) after
  • (B) although
  • (C) for
  • (D) on condition that


【正确答案】 A
【答案解析】空格内应填入连词。所有选项都可以做引导状语从句的连词。表示“只有在……之后”的only after是常用的短语．在这里最符合句意。