B
两个to 那么两件事是复数
To take a walk and to play pingpong___beneficial to your health
To take a walk and to play pingpong___beneficial to your health
A is B are C has been beneficial D have proved to
A is B are C has been beneficial D have proved to
英语人气：534 ℃时间：2020-06-13 09:32:01
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