楼楼,这有点不好解释.Keep exercising是词组,在前面充当主语,to 加上去的话就是“为了坚持锻炼,你会更加的健康.”这使得句子缺少了主语,语文中你也明白,这样的句子不通顺,所以To keep是不对的.如果是keeping的话,这个句子中的“keeping exercising ”就充当了主语,因为动词做主语时,动词要加ing.句式应该改为“keeping exercising will make you healthier.”现在楼主明白了么?如果有什么问题,欢迎你追问.
_____exercising,and you will be healthier A.keep B.To keep C
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