(2012·山东) After completing and signing it, please return the form to us in the envelope __________.
| A．providing |
| B．provided |
| C．having provided |
| D．provide |
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(2012·山东) After completing and signing it, please return the form to us in the envelope __________.
| A．providing |
| B．provided |
| C．having provided |
| D．provide |
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