He neglected to reply to the invitation.
他忘记封那邀请作答复。
You should reply to let the person who sent the invitation know whether or not you plan to go.
你应该回复，让发出邀请的人知道你是否打算去。
For example, if you send me an invitation to speak at a conference and I ask what the topic is, you might reply with just the topic, snipping out all the details of the conference.
举个例子，如果你给我发送一封邮件，邀请我在一个会议上发言，我问发言的主题是什么，你可能只回复我这个主题，剪去了所有关于这个会议的细节。
If the invitation way by formal invitation then you might like to reply in a formal way.
如果是正式的请柬，你最好以正式的方式答复。
If the invitation way by formal invitation then you might like to reply in a formal way.
如果是正式的请柬，你最好以正式的方式答复。
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