题干
一 They refused to go on a picnic on such a windy day.
一 It doesn't matter. You can do it next time.
A：help
B：have
C：provide
答案(点此获取答案解析）
B
一 They refused to go on a picnic on such a windy day.
一 It doesn't matter. You can do it next time.
A：help
B：have
C：provide
与抛物线
只有一个公共点的直线有（ ）