When I met him last weekend, it was the first time we ______ each other since we were at school. 

A．saw

B．have seen

C．were seeing

D．had seen

2011年夏季某城市连续遭受几次严重的城市内涝影响，阅读表格中的数据（单位mm），

城市建设导致了

A．市区蒸发量减少  

B．郊区径流总量减少  

C．市区地下径流增加    

D．郊区降水量减少