17．I have been skating nine o’clock． A．for B．since C．at D．from——青夏教育精英家教网——

摘要：17．I have been skating nine o’clock． A．for B．since C．at D．from

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－Alison, how long have you been skating?

－I have been skating ________ nine o’clock．

A．for

B．at

C．since

D．from

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