有没有知道？？？？

来源：百度知道 编辑：UC知道 时间：2024/06/17 03:31:16
4 If l( )more about giving first aid.I could have helped them
5 The cause of the accident still( )unknown to all

4 If l(knew )more about giving first aid.I could have helped them
如果我对急救术会的更多一些的话，我就能帮他们了。
5 The cause of the accident still( be )unknown to all
事故的起因仍然未知。

am

be

knew
remain

4 If l(had known )more about giving first aid.I could have helped them
5 The cause of the accident still( is )unknown to all

5仍然事故()未知数的起因对所有
4，如果 ()更多关于给急救。我可能帮助了他们