题干
一 What did Danny do yesterday?
一 He took part in the meeting.
A：knew
B：attended
C：left
答案(点此获取答案解析）
B
一 What did Danny do yesterday?
一 He took part in the meeting.
A：knew
B：attended
C：left
＝2a＋pb，
＝a＋b，
＝a－2b.若A、B、D三点共线，则p的值为( )
的最小值为 （ ）