As the wind was beginingto blow,he did his best to calm his

C
首先可能我们第一反应是comforted,都是过去时
但没这个选项,那就要考虑动词怎么变形
而三个选项都是动词的非谓语形式（动词不定式或者分词）,出题意图肯定是动词变形,所以排除A 动词原形
动词不定式to do表示还没做的事情,the book to be published is greatly anticipated
having done表明动作早于主句动作,如having watched the news,he called me about what he thought about
这里两人安慰彼此差不多同时间发生,所以现在分词comforting C