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
Not until many years later
A．the whole truth became known
B．did the whole truth become known
C．the whole truth has become known
D．has the truth become known
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
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