The electronic re d-packet has been so () that AliPay and Tencent Wechat compete against each other openly and secre tly since the beginning of this year. ( 章节：4 难度：2)_做题室

单项选择题The electronic re d-packet has been so () that AliPay and Tencent Wechat compete against each other openly and secre tly since the beginning of this year. ( 章节：4 难度：2): A、popular; B、convenient; C、favorable; D、arbitrary

正确答案：A
答案解析：
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