16. If you need to send documents by mail, please contact us _________ phone or e-mail in order for us
to provide the proper mailing address. (A)at (B)by (C)on (D)with
If you need to send documents by mail, please contact us _________ phone or e-mail in order for us to provide the proper mailing address. (A)at (B)by後面接電話或電子郵件,BY當藉由/靠的意思 (C)on (D)with .