【题目】Terry and his team members were the firsthow the disease spreads from animals to humans.
A.shown
B.showing
C.to show
D.show

【答案】C
【解析】考查非谓语动词。the first/last to do sth.第一个或最后一个做某事的人，此处是动词不定式作后置定语，故选C。