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题目内容
（兰州大学-大学英语3）
(4分)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
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
参考答案