【单选题】
Even professional marketers are never sure ______ some new products are runaway successes while others fail miserably.
A、for
B、why
C、since
D、whoever
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根据网考网移动考试中心的统计,该试题:
0%的考友选择了A选项
70%的考友选择了B选项
10%的考友选择了C选项
20%的考友选择了D选项