题目内容：
阅读下列短文,回答题目.August l3th，2014
Dear Sirs，
I anl very happy to apply for the position of secretary，which you advertised in China Daily ofAugust 11，2014.
I have been working as a secretary at a college office.Because I amthe only secretary in theoffice，it is necessary for me to work quickly and efficiently and to be flexible in my daily work.
Professors value my work and my ability to meet theft needs.
Although I am happy now，I feel that my promotion(晋升)is limited here，and l would liketo have a more challenging job.Therefore，I enrolled(参加)in a program to expand my knowledge of international business affairs.Now，both my English and Chinese have been improved andI am ready to begin working as a bilingual secretary in an international company like yours，and Ibelieve I Can be a great help to your firm.
The enclosed resume gives further details of my qualifications，and l would appreciate it if youcould give me an opportunity to have an interview.I am looking forward to receiving your call at62428866 0r please use the enclosed pre-paid postcard，to send me your reply.
Thank you very much for your consideration.
Faithfully Yours，
Mary Lee
The writer wants to change her job because__________. A．she has difficulties handling her daily work efficiently
B．she call hardly get a chance to be promoted
C．she finds her present job too challenging
D．she is tired of her duties at the college
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