I am always delighted when I receive an e-mail from you. the party on July 1st, I shall be pleased to attendA.On account ofB.In response toC.In view ofD.With regard to
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D解析试题分析：考查介词短语辨析。句意：当我收到你的电子邮件时，总是很高兴的。关于7月1日的聚会，我将非常高兴参加。A. On account of因为，由于B. In response to 对……做出回应C. In view of 考虑到，鉴于D. With regard to关于，至于。根据句意，选择D。
考点：考查介词短语