---Could I go travelling with my classmates during this winter holiday?---No, _____ the novel corona virus epidemic situation(新冠疫情)has changed.A、ifB、beforeC、sinceD、unless-易过题库-题库最全的搜题网站

---Could I go travelling with my classmates during this winter holiday?---No, _____ the novel corona virus epidemic situation(新冠疫情)has changed.