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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 【查看更多】

     

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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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