题干
I'm planning a trip to the beach tomorrow, but still can't decide .
A：where I'm going
B：how I'm going
C：why I'm planning
D：when I'm planning
答案(点此获取答案解析）
B
I'm planning a trip to the beach tomorrow, but still can't decide .
A：where I'm going
B：how I'm going
C：why I'm planning
D：when I'm planning
构成的集合：存在
，且
，有
，下列结论中正确的是（ ）