单选题 ______most school teachers were men, but today there are more women than men.
  • A. At once
  • B. At one time
  • C. At present
  • D. At the time
【正确答案】 B
【答案解析】[解析] 上下文的意思是：学校的老师多数曾经是男性。因此，答案是B) (曾经，一度)。A)At once马上，立刻；C)At present现在；D)At the time在那时。