单项选择题

The meeting ______going on since eight o'clock this morning.

A． has been
B． was
C． is
D． will be
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单项选择题
If the bills ______in five days, the company will seek damages.
A． weren't paid
B． won't have paid
C． aren't paid
D． don't pay
单项选择题
______ substantial layoffs, costs were reduced.
A． When
B． Because of
C． Although
D． Since
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