题干
——＿＿＿＿＿ Betty this morning?
—— Not yet, but she is sure to be here before noon.
A：Have you see
B：Will you see
C：Do you see
D：Did you see
答案(点此获取答案解析）
A
A：Have you see
B：Will you see
C：Do you see
D：Did you see
：
，命题
：一元二次方程
有实数解．则
是
