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    假定你是李华，你的美国朋友John,本周日想邀请你去他的寄宿家庭参加朋友聚会，但你无法参加。请依据下列要点，给Jim发封电子邮件。

    要点：1.感谢邀请；

    2.陈述不能参加的原因（高考即将来临，身体状况不好），并表示歉意。

    注意：1.词数100左右；

    2.可以适当增加细节，以使行文连贯。

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