问题
单项选择题
She was living with her uncle, who had returned from Japan（）
A. long ago
B. before long
C. long before
D. three years ago
答案
参考答案：C
解析：
long before很久以前，句中用完成时态；long ago很久以前，句中用一般过 去时；before long不久以后。
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