The Smiths ______ sending e-mails ______ letters because it is faster.
| A．prefer; to writing | B．prefer; to write | C．prefers; to writing | D．prefers; to write |
The Smiths ______ sending e-mails ______ letters because it is faster.
| A．prefer; to writing | B．prefer; to write | C．prefers; to writing | D．prefers; to write |
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