问题标题：
it'ssunnytoday.___itisverycoldAalthoughBbutCsoDhowever详细讲解it'ssunnytoday.___itisverycoldAalthoughBbutCsoDhowever
问题描述：
it'ssunnytoday.___itisverycoldAalthoughBbutCsoDhowever
详细讲解it'ssunnytoday.___itisverycold
AalthoughBbutCsoDhowever
顾慧芳回答：
B今天天气晴朗,但是很冷.but表转折
although是虽然的意思however后要用逗号隔开
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