题干
It is a pity that we have to ___________ the school trip because of the rainy days.
A：set off
B：go off
C：put off
D：take off
答案(点此获取答案解析）
C
It is a pity that we have to ___________ the school trip because of the rainy days.
A：set off
B：go off
C：put off
D：take off
”是“方程
表示焦点在y轴上的椭圆”的 （ ）