Humans are polluting the earth day by day of course will cause punishment sooner or la

问题补充：

Humans are polluting the earth day by day, , of course, will cause punishment sooner or later.

A. that

B. it

C. which

D. what

答案：

A. that

B. it

(答案→)C. which

D. what

解析：定语从句考查题。先行词为主句，关系词which指代整件事并在从句中作主语。句意：人类一天天污染地球当然这会迟早遭到惩罚。