A:all in all
B:at the same time
C:in the end
D:in other word
迈克什么时候爬上山的?
When did Mike____the hill?
已知P为椭圆x225+y29=1上一点, F1、F2为椭圆的两个焦点,且|PF1|=3, 则|PF2|=( )