地震预报分为几种预报（）
A、四种
B、三种
C、五种
参考答案：A
．--- I’m sorry. I should not have been so rude to you.
--- You____-- something not very nice to me, but that’s OK.
A．have said
B．had said
C．were saying
D．did say
影响行业进入障碍的因素主要有哪些？
