单选题 The fire was finally brought under control, but not ______ extensive damage had been caused.
  • A. after
  • B. before
  • C. since
  • D. as
【正确答案】 B
【答案解析】[解析] 此题考查的是从属连词的意义和用法。从结构上看，题干后一部分的not实际上代替了一个被省略了的主句。