单项选择题
Cement was
seldom
used in building the Middle Ages.
A. crudely
B. rarely
C. originally
D. occasionally
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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
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单项选择题
Even the best - build machine will not run forever without proper maintenance.
A. eternally
B. smoothly
C. dependably
D. accurately
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