We must make to the public that something should be done to stop pollution.
A. what is clear
B. it is clear
C. it clear
D. that clear
网友回答
A. what is clear
B. it is clear
(答案→)C. it clear
D. that clear
解析：考查形式宾语。It 是形式宾语，真正的宾语是that something should be done to stop pollution.形容词clear是宾语补足语。句意：未命名必须向公众讲清楚应该采取措施来阻止污染。