To take a walk and to play pingpong___beneficial to your healthA is B are C has been beneficial D have proved to
问题描述：
To take a walk and to play pingpong___beneficial to your health
A is B are C has been beneficial D have proved to
答
A吧，牵涉到主谓一致，它考的就是这个吧，选A应该不会错的。
答
A
主谓一致
老师说的
答
B
两个to 那么两件事是复数