题文
E-mails can _______ a lot of phone calls because almost everybody prefers things that are written and not just said on the phone.
| A．exchange |
| B．represent |
| C．reduce |
| D．replace |
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E-mails can _______ a lot of phone calls because almost everybody prefers things that are written and not just said on the phone.
| A．exchange |
| B．represent |
| C．reduce |
| D．replace |
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