【单选题】For many middle-aged people, when it comes to ______ for retirement, they are not quite sure about how much money they should save and spend.
- (A) prepare
 - (B) preparing
 - (C) prepared
 - (D) prepares
 
【单选题】For many middle-aged people, when it comes to ______ for retirement, they are not quite sure about how much money they should save and spend.
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