他努力鼓起勇气向老板提出加薪请求。
He struggled to ___muster the courage to ask his boss for a raise.
他鼓起全部力量完成了最后100米的冲刺。
He ___mustered all his strength to finish the last 100 meters of the race.
He was ___mustering the courage to ask his boss for a raise.
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