题干
— Have you seen the TV play My Ugly Mother?
— Yes, it's well worth ________. It's ________ moving that I've seen it twice.
A：seeing; so
B：to see; enough
C：seeing; too
D：to see; such
答案(点此获取答案解析）
A
的夹角为
，且
,
，在
ABC中，
，D为BC边的中点，则
（ ）