![](https://lstatic.shangxueba.com/jiandati/h5/images/m_q_title.png)
Directions: Read the case carefully and decide which is the best “subject line”. David wil
A、Write David an email about this with the subject “Travel Update”.
B、Write David an email about this with the subject “ Two Changes in Your Shanghai Itinerary”.
C、Write David an email about this with the subject “ Urgent-Two Important Changes in Your Shanghai Itinerary”.
D、Write David an email about this with the subject “ Urgent”.