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

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I have been skating _______ nine o’clock.

A. for B. since C. at D. from

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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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