第6题: [单项选择]When the colonel learned that headquarters had been unable to send him reinforcements, he ______ the order for the scheduled attack. A. countermanded B. relinquished C. rephrased D. invalidated 参考答案:A 答案解析:(countermand撤消命令)。句意为:上校听说司令部未能给他派去援军,他撤消了预定进攻的命令。B.relinquish放弃;C.rephrase给……重新措辞;D.invalidate使无效。