根据网考网考试中心的统计分析，以下试题在2016-1-21日考博习题练习中，答错率较高，为：42%
【单选题】 The retired engineer plunked down ＄ 50000 in cash for a mid-size Mercedes as a present for his wife ——a purchase ______ with money made in the stock market the week before.
A．paid off
B．paid through
C．paid out
D．paid for
参考答案：D，答错率：42%
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