证券在证券交易所采取的交易方式是( )。
A．公开的集中竞价 B．公开一对一销售C．公开按规定价格销售 D．公开按协议价格销售
参考答案：A
John and I _____ friends for eight years. We first got to know each other at a Christmas party. But we _____ each other a couple of times before that.
A．had been; have seen
B．have been; have seen
C．had been; had seen
D．have been; had seen
芝麻一生包括哪几个生育时期？
