He has been collecting coins _______ he was seven years old. A. because B. while C. when D. since
2023-02-26 03:08:33 53次 2011年宁夏回族自治区中考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
He has been collecting coins
_______ he was seven years old.
A. because B. while C.
when D. since
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