单选题 We carved their names on the stone so that younger generations could know what their forefathers______for the nation.
  • A) did
  • B) were doing
  • C) had done
  • D) have been doing


【正确答案】 C
【答案解析】[考点] 过去完成时
[解析] 在动作carved发生以前，从句中的动作已经发生了，所以从句中的时态应该比主句的时态更早。主句用一般过去时，从句应该用过去完成时。