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【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：

3%的考友选择了A选项

80%的考友选择了B选项

1%的考友选择了C选项

16%的考友选择了D选项

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