If you just spend your time gains and losses, maybe you'll get nothing in the endA. check

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A. checking
(答案→)B. weighing
C. balancing
D. examining
解析：句意：如果你只是花时间权衡得失，也许你会最终什么也得不到。结合词意：checking检查；weighing 称重，权衡；balancing 平衡；examining检测。故选择B。
考点: 考查动词在具体语境中的运用。