许可电子邮件营销与群发邮件营销最本质的区别在于前者是基于用户许可，提供的信息对客户是有价值的。
参考答案：对
—Peter, you look so tired and wet all over!
—Yes, all afternoon I ________ football on the playground.
A．am playing
B．have been playing
C．played
D．have played
圣训又是怎样论述复活的？
