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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单项选择题
Cement was seldom used in building the Middle Ages.
A. crudely
B. rarely
C. originally
D. occasionally
单项选择题
The police are trying to get back the stolen statue.
A. detain
B. regain
C. track
D. detect
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