单选题 ______ the Europeans began to learn how to use the compass on their ships.
  • A. It was not until the 12th century when
  • B. Hardly it was the 12th century than
  • C. No sooner it was the 12th century when
  • D. It was not until the 12th century that
【正确答案】 D
【答案解析】[解析] 只有D项是强调结构形式，其他均不是。