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
We were astonished to hear that their football team had won the champion.
A．amazed
B．amounted
C．amused
D．approached
单项选择题
Techniques to employ the energy of the sun are being developed.
A．convert
B．store
C．use
D．receive
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