关于文法选择 A World Heritage Site and one of the New Seven Wonders of the World, Machu Picchu is Peru's most visited attraction, welcoming hundreds of thousands of people a year. _______ tourism and the development of nearby towns continue to cause harm to the site, which is also home to several endangered species. _______的选项有: (A) Increasing (B) Increased (C) To increase (D) Being increased 答案是B,请问为何不能选A呢? 谢谢!