I really enjoyed your speech, there were some parts I didn’t quite understand.
A. because
B. since
C. until
D. though
网友回答
A. because
B. since
C. until
(答案→)D. though
解析：A. because因为 B. since 自从 C. until 直到 D. though尽管，虽然；句意：我真的喜欢你的演讲，虽然有一些部分我不很理解。故选D