[单选题]Discourse markers are words and phrases that are used to _____.wt5答案窝(daanwo.com)-大学生作业答案及考资分享平台 Amark sentenceswt5答案窝(daanwo.com)-大学生作业答案及考资分享平台 Bexpress different ideaswt5答案窝(daanwo.com)-大学生作业答案及考资分享平台 Cindicate pauseswt5答案窝(daanwo.com)-大学生作业答案及考资分享平台 Djoin ideas together