Global_changes may have been responsible for the extinction

Global_changes may have been responsible for the extinction i have been responsible for the training and production of h 英语翻译As she had been entirely responsible for the accident in the reasons for the extinction of dinosaurs什么意思 and the extinction of one species' wild population can have You have been the one for this may have been close to the truth这个have been后面为什么加close原 In what ways have you been responsible /impossible? it is___that am responsible for the accident You should be responsible for the accident. may not have been...与 may have not been ... may have been怎么用