Xiao Li was supposed __________ her homework before nine o'clock. But she couldn't.
A:to finish
B:to finishing
C:finish
D:finishing
如图,抛物线C:y2=2px的焦点为F,抛物线上一定点Q(1,2).
阅读诗歌,回答问题
四时田园杂兴
宋·范成大
梅子金黄杏子肥,麦花①雪白菜花稀。
日长篱落无人过,唯有蜻蜓蛱蝶②飞。
【注释】①麦花:荞麦花。荞麦是一种春秋皆可种植的农作物。②蛱蝶:蝴蝶。