She often devotes her spare time to helping others.为什么help 要加ing
问题描述：
She often devotes her spare time to helping others.为什么help 要加ing
答
to 是介词,后加动名词这里的to不是动词不定式符号
She often devotes her spare time to helping others.为什么help 要加ing
to 是介词,后加动名词这里的to不是动词不定式符号