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答案：C
解析：
Choice C is the best answer. According to the author, the benefits of humor for individuals and in certain social situations were established before Lehmann-Willenbrock and Allen's study, but Lehmann-Willenbrock and Allen looked specifically at workplace humor and its effect on a corporation's outcomes in terms of "team efficiency and productivity." In other words, they considered how humor affects the achievements of a group or groups.
