5. 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

相關(guān)內(nèi)容：

2012年12月公共英語(yǔ)考試每日一練匯總

（責(zé)任編輯：中大編輯）

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