--Did you listen to the speech?

--- No, we ______ it. But we had a lot of traffic on our way.

A．could have attended

B．must have attended

C．could attend

D．shouldn't have attended

配制木屑水泥止水材料时，先将木屑与水泥干拌均匀，然后摊开徐徐洒水，边洒水边搅拌均匀，直至（），即为合格可用。

A、手抓紧成团，放下后仍然成团

B、手抓紧成团，放下散开

C、呈现散粒状

D、水泥吸水饱和