单选题 When television was first (introduced), the extent to (that) it would (affect) society could not (have been foreseen).
  • A. introduced
  • B. that
  • C. affect
  • D. have been foreseen


【正确答案】 B
【答案解析】应为which。本句中to为介词，介词后的关系代词不可以用that替代which。