They have been skating ______.

A. for three hours ago
B. since three hours ago
C. three hours ago
D. since three hours
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科目：初中英語 來源：同步題 題型：單選題

They have been skating ______.   
[     ]
A. for three hours ago
B. since three hours ago     
C. three hours go 
D. since three hours

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科目：初中英語 來源：同步題 題型：單選題

They have been skating ______.
[     ]
A. for three hours ago
B. since three hours ago
C. three hours ago
D. since three hours

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科目：初中英語 來源：安徽省期中題 題型：單選題

They have been skating _______.

[     ]

A. for three hours ago
B. since three hours ago
C. three hours ago
D. since three hours

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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

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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 _________．

[　　]
A．

for three hours ago

B．

since three hours ago

C．

three hours ago

D．

since three hours

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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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