题干
----Would you join us in the summer camp ?
---- , you see.
A：It all depend
B：It doesn't matter
C：That is right
D：I'll follow you
答案(点此获取答案解析）
A
A：It all depend
B：It doesn't matter
C：That is right
D：I'll follow you
为两个互相平行的平面，
为两条不重合的直线，下列条件：①
，
；
③
④
其中是
的充分条件的是（ ）