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来源：网络资源 2009-05-09 09:07:34
Unit 6 How long have you been collecting shells? Period 2
A: How long have you been skating?
B: I've been skating since I was seven years old.
A: How long have you been skating?
B: I've been skating since nine o'clock.
A: How long did you skate?
B: I skated for two hours
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