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
Who usually does the shopping in this family（）

A. Mother and Father.
B. Father and David.
C. Mother and Adam.
D. Adam and David.
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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