the retired man donated most of his savings to the school damaged by the earthquake

问题描述:

the retired man donated most of his savings to the school damaged by the earthquake
in Yushu,___the students to return to their classrooms.
1 enabling 2 to have enabled
选择哪一个,及分别说出为什么对与错

答案为A.
enable与句子的主语the man为主动关系,分词则用现在分词;
to do短语用逗号与前面分开,则表示出乎意料的结果.