题目内容：
回答题August 13th, 2008 Dear Sirs,
I am very happy to apply for the position of secretary, which you advertised in China Daily of August 11, 2008.
I have been working as a secretary at a college office. Because I am the only secretary in the office, 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 their needs.
Although I am happy now, I feel that my promotion (晋升) is limited here, and I would like to have a more challenging job. Therefore, I enrolled ( 参加 ) in a program to expand my know-ledge of international business affairs. Now, both my English and Chinese have been improved and I am ready to begin working as a bilingual secretary in an international company like yours, and I believe I can be a great help to your firm.
The enclosed resume gives further details of my qualifications, and I would appreciate it if you could give me an opportunity to have an interview. I am looking forward to receiving your call at 62428866 or 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 can 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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