Look,There are many people in the park A exercise B to exercise C is exercising D exercising

问题描述:

Look,There are many people in the park A exercise B to exercise C is exercising D exercising
选哪一个,为什么

D
现在分词作状语.(因为前面已有动词ARE)
翻译:看,公园里有很多人在锻炼.
加油!不明白再问!