单项选择题

In my opinion standards of workmanship have ______ over the past 20 years.

A．aggravated
B．diminished
C．deteriorated
D．eroded
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单项选择题
Such ______ the case, there are no grounds to justify your complaints.
A．was
B．is
C．is being
D．being
单项选择题
All the members of the committee agreed that Mr. Smith was the right person to hold such an important position. They made an ______ decision.
A．simultaneous
B．subsequent
C．unanimous
D．arbitrary
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