问题补充:
----Doctors, it seems that you like to work with animals.
----Yes, I think animals should as our friends.
A. regard
B. be regarded
C. be regarding
D. are regarded
答案:
A. regard
(答案→)B. be regarded
C. be regarding
D. are regarded
解析:句意:大夫,好像你喜欢和动物们共事?——是的,我认为动物们应该被当做我们的朋友。结合语境可知动物们是动作的对象,故用被动语态,情态动词should后面动词用原形,故选B。