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They have been skating .A. for three hoursB. since three hours ago C. three hours agoD. si
They have been skating .A. for three hoursB. since three hours ago C. three hours agoD. si
发布时间：2020-08-22 01:13:39
They have been skating .
A. for three hours
B. since three hours ago
C. three hours ago
D. since three hours
网友回答
(答案→)A. for three hours
B. since three hours ago
C. three hours ago
D. since three hours
解析：for 一段时间，为现在完成时态的时间标志，故选答案为A
以上问题属网友观点，不代表本站立场，仅供参考！
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