单项选择题

______ work has been done to improve people' s living standard.

A. Many
B. A great many
C. A large number of
D. A great deal of
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单项选择题
If you want to become a doctor, you ought to study ______.
A. medicine
B. the medicine
C. literature
D. the literature
单项选择题
Play is usually more enjoyable than ______.
A. a job
B. job
C. a work
D. work
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