题干
The beach is so beautiful that it is worthwhile, I think, _____ for a short holiday.
A：of going
B：to be going
C：your going
D：you to go
答案(点此获取答案解析）
C
A：of going
B：to be going
C：your going
D：you to go
= 
，DE∥BC交AC于E，AM是BC边上中线，交DE于N．设 
=b，用a，b分别表示向量 
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． 
