14._____the importance and value of these historic sites to everyone, the government began to propose regulations to protect them.
答案解析
解析：
分析句子结构可知,空处应用非滑清动词。the government和stress之间是逻辑上的主谓关系,且 stress表示的动作发生在began表示的动作之前,所以应用现在分词的完成式,和后面的the importance and value of these historic sites to everyone 一起作时间状语。故选C。
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