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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单项选择题
______ in the doorway, the house appeared to be much smaller than it had seemed to us as children many years ago.
A．When we stood
B．Being standing
C．Standing
D．Stood
单项选择题
He proposed that we ______ a party for the success of the basketball match.
A．held
B．hold
C．would hold
D．to hold
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