【单选题】
The tennis players need total ___ during play.
A. concentration
B. section
C. depression
D. energy
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Surgeons began to ___ their hands and arms with soap and water before operating.
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Do not ___ the salad until you are ready to serve.
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The ___ for which he had fought all his life no longer seemed important to him.
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A. tweet
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I want to buy a new tie to ___ this brown suit.
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