单项选择题

Next semester, Susan must take three compulsory courses.

A. formal
B. voluntary
C. practical
D. required
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单项选择题
The police are trying to get back the stolen statue.
A. detain
B. regain
C. track
D. detect
单项选择题
In the first decades of this century, the individual gene could be worked with fruitfully.
A. blindly
B. completely
C. productively
D. carefully
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