15、--How long have you been studying today?

--_____.

A．After 7 o’clock                                       B．At seven o’clock.

C．Since 7 o’clock                                         D．7 o’clock ago

15、C

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--How long have you been studying today?

--_____.

A．After 7 o’clock                                       B．At seven o’clock.

C．Since 7 o’clock                                         D．7 o’clock ago

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