题干
— Leonardo didn't win an Oscar __________ he acted in The Revenant《荒野猎人》.
— Yeah. It was hard for him to realize this dream, but he never gave up.
A：after
B：since
C：because
D：until
答案(点此获取答案解析）
D
无实数根，则⊙O与直线l的位置关系（ ）