客运专线铁路CRTSⅡ型板式无砟轨道混凝土轨道板，每隔（）制作1组28天混凝土弹性模量试件。

A、周；

B、半个月；

C、一个月。

—This is the first time I_________ my first picture with my own hands.

—It is time that you_________a picture for me.

A．took;took

B．have taken;took

C．took;will take

D．will take;have taken