单项选择题

Since 1990, our customers ______with our service.

A． are satisfied
B． have satisfied
C． have been satisfying
D． have been satisfied
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单项选择题
A survey of the ______shows they are satisfied with their jobs.
A． employment
B． employs
C． employees
D． employing
单项选择题
The electricity went out ______we were making coffee.
A． so
B． because of
C． while
D． for
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