The first thing we should do is to protect the wild animals .A. that B. which C. whatD. ho

问题补充：

The first thing we should do is to protect the wild animals .

A. that

B. which

C. what

D. how

答案：

(答案→)A. that

B. which

C. what

D. how

解析：修饰名词是一个句子为定语从句，若先行词是物，关系词可用which或that，但

先行词前有序数词时，通常用that，故选A。