单项选择题

What we can know about the retired engineer in this text

A．The retired engineer overcharged for his service.
B．The retired engineer happily went to examine the machine.
C．The retired engineer changed the broken part for a new one.
D．The retired engineer did find out what was wrong with the machine.
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单项选择题
Several years after his retirement, the engineer's company ______.
A．bought a very advanced machine
B．had a very expensive machine out of order
C．placed an order for a very expensive machine
D．had difficulty destroying a very expensive machine
单项选择题
According to this text, the purpose of motivation study was to discover ______.
A．why there were deeper reasons
B．why instant coffee did not taste good
C．why regular coffee was successful
D．why people resisted instant coffee
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