A good night’s sleep is a ______of having good recall in the weeks ahead, scientists have found.

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问题 A good night’s sleep is a ______of having good recall in the weeks ahead, scientists have found.

选项 A、appeal
B、call
C、request
D、prerequisite

答案D

解析 appeal呼吁;call号召;request要求,请求;prerequisite先决条件,前提。故选D项。
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