成人高考考试

根据网考网考试中心的统计分析，以下试题在2019/10/30日成人高考高起点习题练习中，答错率较高，为：63%
【单选题】Nobody knew _______ there.
A、how long time I had been
B、how long had I been
C、how long time had I been
D、how long I had been
网考网参考答案：D，答错率：63%
试题解析：
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