题目内容
（请给出正确答案）
[单选题]
Which of the following letter parts is optional()?
A.dateline
B.subject line
C.writer' s name
D.salutation
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.dateline
B.subject line
C.writer' s name
D.salutation
如果结果不匹配，请 联系老师 获取答案
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