【单选题】
Although customers keep complaining about their poor service, they've made no ______ to make any improvement.
A.action
B.trial
C.attempt
D.progress
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根据网考网移动考试中心的统计,该试题:
1%的考友选择了A选项
4%的考友选择了B选项
81%的考友选择了C选项
14%的考友选择了D选项