考博考试

根据网考网考试中心的统计分析，以下试题在2018/4/10日考博习题练习中，答错率较高，为：68%
【单选题】The survey showed that ______ numbers of 15-year-olds were already smoking twenty cigarettes a week.
A．essential
B．steady
C．primary
D．substantial
网考网参考答案：D，答错率：68%
网考网试题解析：
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