— 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
受气候条件的影响，欧洲西部的农业以（ ）
建立了电磁场理论并预言了电磁波的存在的科学家是（ ）
对《使至塞上》这首诗理解不正确的一项是( )。
