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.

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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.

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.
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.

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.