单项选择题

Cement was seldom used in building during the Middle Ages.

A. crudely
B. rarely
C. originally
D. symbolically
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单项选择题
We shall take the treasure away to a safe place.
A. clean
B. pretty
C. distant
D. secure
单项选择题
There is an abundant supply of cheap labor in this country.
A. a steady
B. a plentiful
C. an extra
D. a meager
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