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The computer, which is a 20th century invention, has created startling technological changes in the way we organize and produce information.（）
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
The computer, （） is a 20th century invention, has created startling technological changes in the way we organize and produce information.
The computer, that is a 20th century invention, has created startling technological changes in the way we organize and produce information.（）
The computer, it is a 20th century invention, has created startling technological changes in the way we organize and produce information.（）
A.that
B.which
C.when
D.what
A.that
B.what
C.which
D.those
A.concentrated
B.focused
C.attracted
D.absorbed
