We carved their names on the stone so that younger generations could know what their forefathers______for the nation.

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问题 We carved their names on the stone so that younger generations could know what their forefathers______for the nation.

选项 A、did
B、were doing
C、had done
D、have been doing

答案C

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。

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大学英语三级B级

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