单项选择题

A new system of quality control was brought in to overcome the defects in the firm's products.

A．invested
B．introduced
C．installed
D．insisted
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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
Cement was seldom used in building the Middle Ages.
A．crudely
B．rarely
C．originally
D．occasionally
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