1.to solve,因为是将要解决
2.solved,从花了两小时可以知道是已经解决了
3.being discussed,从now可见是正在被讨论,不直接discussed是因为不能表现出进行时
那个practise是什么?句子不完整
非谓语作定语填空 Here is a problem____(solve) A _____（practise）techn
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