题干
Having a picnic with friends ________ more fun on Sunday.
A：is
B：are
C：have
D：has
答案(点此获取答案解析）
A
Having a picnic with friends ________ more fun on Sunday.
A：is
B：are
C：have
D：has
为参数）和定点 
F1，F2是圆锥曲线的左右焦点。