[单选题]Transitions like “at first”, “then”, and “now”, are expressions indicating ____________.BiN答案窝(daanwo.com)-大学生作业答案及考资分享平台 Atime sequenceBiN答案窝(daanwo.com)-大学生作业答案及考资分享平台 Bcomparison and contrastBiN答案窝(daanwo.com)-大学生作业答案及考资分享平台 CclassificationBiN答案窝(daanwo.com)-大学生作业答案及考资分享平台 Dcause and effect