我保证用英语怎么说?

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我保证用英语怎么说?

我保证:by my trothExamples:1.他向我保证星期五一定准备好.He gave me an assurance that it would be ready by Friday.2.我保证我没有告诉过任何人.I didn't tell anyone,on my oath.3.不客气.我保证您会发现我们...