—Fire is very useful to human!
—Yes, especially in winter a fire _____________warm.
| A．used to keep | B．can be used to keep |
| C．is used to keeping | D．was used to keeping |
—Fire is very useful to human!
—Yes, especially in winter a fire _____________warm.
| A．used to keep | B．can be used to keep |
| C．is used to keeping | D．was used to keeping |
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