It's not easy ___to play table tennis 1 learn 2 learns 3to learn 4learning 应该填什么 为什么

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It''snoteasy___toplaytabletennis1learn2learns3tolearn4learning应该填什么为什么It''snoteasy___toplaytabletennis

It's not easy ___to play table tennis 1 learn 2 learns 3to learn 4learning 应该填什么 为什么
It's not easy ___to play table tennis
1 learn 2 learns 3to learn 4learning 应该填什么 为什么

It's not easy ___to play table tennis 1 learn 2 learns 3to learn 4learning 应该填什么 为什么
3to learn ,加to do sth