图中右为“江南丘陵某县农村生活用能构成图”，左为“该县农村秸秆利用方式比例图”。

There was a lot of fun at the party. You ________, but why didn't you?[ ]

A．should come  

B．ought to have come

C．may have come  

D．must have come

— Mr. Priestly has just accepted our offer over the phone.

— Good, but you must ask him to _______ it in writing.[ ]

A. consume        

B. confirm    

C. consult        

D. conduct

使用电机车牵引得机车掉道复轨时，应有可靠的措施。

用混凝上空心砌块砌筑的房励I、墙转角处和楼梯问四角的砌体孔洞内，应设置不小于φ12的竖向钢筋并用（）细石混凝土灌实。

A．ClO

B．C15

C．C20

D．C30