问题
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;
B:are used to; are used for
C:used to; are used for
D:are used to; used to;
正确答案是：
同类题型
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