Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock?
| A．off; back | B．up; off | C．out; up | D．back; off |
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Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock?
| A．off; back | B．up; off | C．out; up | D．back; off |
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