Studying nature reserves( ) us learn more adout protecting animals. A helps B to help C help

分类: 作业答案 • 2021-12-31 13:46:36

问题描述：

Studying nature reserves( ) us learn more adout protecting animals. A helps B to help C help
则么想的,为什么这样填?请快点告诉答案.

答

答案：A
Studying nature reserves 是动词ing形式短语作主语,谓语动词用单数形式.