The manager listened to the customers’ complaints attentively with great patience, to mis

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A. not trying
(答案→)B. trying not
C. to try not
D. not to try
解析：考查现在分词做状语，句意：经理很耐心的听顾客的投诉，尽量不错过任何一点。这里是非谓语动词做状语，manager和try是主动关系，用现在分词做状语，从句意看是try not to do尽量不做什么，用不定式的否定。选B。