―Could you _______ take care of my dog while I’m away?

―Sure. Leave it to me, please.                

A．perhaps

B．possibly

C．maybe

D．probably

采油树主要由总闸门、生产闸门、清蜡闸门及其他各种闸门、油管四通、（）、法兰等组成。

A.套管四通

B.油管

C.套管

D.回压闸门