摘要：5．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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They have been skating _________．
[ ]
A．
for three hours ago
B．
since three hours ago
C．
three hours ago
D．
since three hours
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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