单选题
Most of us have come to realize that it is about time (that) we ______ effective measures to prevent all kinds of pollution.
【正确答案】
B
【答案解析】[分析] 此题考点为虚拟语气句。本句意为：我们中大部分人已经开始意识到，该是采取有效措施防止各类污染的时候了。在It is about time that=It is high time that=It is time that后面的句子中，谓语用过去式，虚拟语气译成“该是…的时候了”。