People write letters to friends and relatives, but now WeChat and QQ communicating with others widely.
| A．used to; are used to |
| B．are used to; are used for |
| C．used to; are used for |
| D．are used to; used to |
People write letters to friends and relatives, but now WeChat and QQ communicating with others widely.
| A．used to; are used to |
| B．are used to; are used for |
| C．used to; are used for |
| D．are used to; used to |
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