I came to the national park,_____,to witness the variety and quantity of its wildlife.
问题描述：
I came to the national park,_____,to witness the variety and quantity of its wildlife.
A as so many visitors B as so many visitors do
C like so many visitors come D as so many visitors come
答
选B,因为前面已经有came to了,后面就不要再说明了,用助动词do指代即可.