根据网考网考试中心的统计分析，以下试题在2017/8/23日托福考试习题练习中，答错率较高，为：77%
【单选题】Ronald Reagan had served two terms as governor of California before （） President.
A. he became
B. when becoming
C. became
D. did he become
网考网参考答案：A，答错率：77%
网考网试题解析：
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