单项选择题

The manager, as well as some workers ______ yesterday afternoon.

A．were working
B．was working
C．has been working
D．have been working
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单项选择题
The computer, ______ is a 20th century invention, has created startling technological changes in the way we organize and produce information.
A．that
B．which
C．what
D．it
单项选择题
Tommy said that he ______ back within ten minutes.
A．will be
B．would be
C．be
D．was
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