单项选择题

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
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My mother tried to ______ a little money each month for his summer ruction.
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B．set aside
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The seminar, ______ by the Nobel Prize winner, probes the problem of wildlife extinction in African countries.
A．convened
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C．incurred
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