| They have been skating ______. |
A. for three hours ago B. since three hours ago C. three hours ago D. since three hours |
科目：初中英語 來源：同步題 題型：單選題
科目：初中英語 來源：同步題 題型：單選題
科目：初中英語 來源：安徽省期中題 題型：單選題
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科目：初中英語 來源： 題型：
They have been skating __________.
A. for three hours ago B. since three hours ago
C. three hours ago D. since three hours
科目：初中英語 來源：安徽省阜陽市謝橋鎮(zhèn)中心學(xué)校2010-2011學(xué)年八年級下學(xué)期期中考試英語試題A 題型：016
They have been skating _________．
for three hours ago
since three hours ago
three hours ago
since three hours
科目：初中英語 來源：2011-2012學(xué)年陜西西安音樂學(xué)院附屬中等音樂學(xué)校初二下期末英語卷（解析版） 題型：單項填空
They have been skating __________.
|
A．for three hours |
B．since three hours ago |
|
C．three hours ago |
D．since three hours |
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