问题
选择题
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
答案：C
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。
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