求英语语法高手来回答？

对划线部分提问） _________ _________ has he been a top fashion desi The students have worked on the survey since 8 o’clock. (对划线部分提问) _________ _________ have the students worked on the survey？

He has been a top fashion designer since 2002.  （对划线部分提问） _________ _________ has he been a top fashion designer? gner?

是不是两个都用How soon 提问啊？总感觉不对

HOW SOON 是提问频率的

应该是HOW LONG

对划线部分提问） __划线部分在哪儿_______ _________ has he been a top fashion desi The students have worked on the survey since 8 o’clock. (对划线部分提问) _________ _________ have the students worked on the survey？