13. (单选题) Adult education has become popular （）. (本题1.0分) A、 because many old people are changing their professions B、 because some people are looking for better jobs C、 because they have high costs for repairs and advanced technology D、 all of the above

13. (单选题) Adult education has become popular （）. (本题1.0分)
A、 because many old people are changing their professions
B、
because some people are looking for better jobs

C、 because they have high costs for repairs and advanced technology
D、 all of the above

出自：河南城建学院大学英语四

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