为便于腹腔器官的采出，在剖开腹腔时采取右侧卧位的动物是（）

A.牛

B.羊

C.马

D.鸡

E.鹅

So much progress ________ made in studies that he is sure to pass the coming examination.

A．is he

B．has he

C．he is

D．he has