非谓语动词做主语——to strong sunlight for a long time will do harm to our skin A Exposed B to expose C Exposing D Being exposed 为什么不能选第四个啊,那些非谓语动词可以做主语啊

问题描述:

非谓语动词做主语
——to strong sunlight for a long time will do harm to our skin
A Exposed B to expose C Exposing D Being exposed
为什么不能选第四个啊,那些非谓语动词可以做主语啊