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[单选题]What is not the characteristic of the subject line? n0N答案窝(daanwo.com)-大学生作业答案及考资分享平台
Ashort and serve as an immediate referencen0N答案窝(daanwo.com)-大学生作业答案及考资分享平台
Blong and serve as a referencen0N答案窝(daanwo.com)-大学生作业答案及考资分享平台
Cfocused and specificn0N答案窝(daanwo.com)-大学生作业答案及考资分享平台
Dthe most important words at the beginning

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