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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单项选择题
It is said the houses along this street will soon be demolished.
A. pulled down
B. pulled up
C. pulled off
D. pulled in
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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