单项选择题

Questions 147-149 refer to the following note.
Dear Blair,
I wanted to take a moment to let you know that I am leaving my post at Stewart Company. I will be starting a new position at Kayla Corporation next month.
I have enjoyed my tenure here and (147) having the opportunity to work with all of you. Thank you for your support, (148) and encouragement you have provided me during my time at Stewart.
Even though I will miss my colleagues and the company, I am looking forward to this new challenge and to (149) a new phase of my career.
Please keep in touch. I can be reached at my personal E-mail address (Samantha 7925 @ hotmail. com) or at home (66554367).
Thanks again for everything.
Yours Truly,
Samantha

A. setting
B. set
C. be set
D. being set