题目内容：

假如你是张莹,上周在外教Mr.John的口语课上使用手机被老师发现,手机被没收。请给外教写一封道歉信,内容应包括以下要点：1.表示歉意；  2.解释上课使用手机的原因；  3.提出自己的请求并适当表态。 

注意：1.字数100左右; 

2.可适当添加细节使文章连贯；

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