单选题 Jack was in the conference room (discussing) plans with (the other) committee members when the chairman (had called) to say (he'd be late).
  • A. discussing
  • B. the other
  • C. had called
  • D. he'd be late


【正确答案】 C
【答案解析】时态错误，应改为called。call的动作和discuss是发生在同一个时间段，而不是在此之前，因此不能用过去完成时。