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!