问题描述:

单选题

Humans are polluting the earth day by day, ________, of course, will cause punishment sooner or laterA.thatB.itC.whichD.what

网友答案:
C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。
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