I prefer taking exercise in my spare time______healthy.A.to keepB.to keepingC.rather than keepingD.rather than keep
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A解析句意：我更喜欢在空余时间做运动来保持健康。to keep healthy做目的状语。本题受思维定势的影响容易选B，prefer doing sth to doing sth,但不合逻辑。
考点：prefer 的用法
点评：做题时要认真细致，不受思维定势的影响。注意prefer 的用法：prefer A to B 相比于B更喜欢prefer doing to doing，prefer to do rather than do相比于做某事（后）更喜欢做某事（前）