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
There is an abundant supply of cheap labor in this country.
A．a steady
B．a plentiful
C．an extra
D．a stable
单项选择题
There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.
A．beats
B．matches
C．maintains
D．announces
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