单项选择题

In ______ century, computers will be used more widely.

A．twenty-one
B．the twenty-one
C．twenty-first
D．the twenty-first
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I think he studies very hard, ______
A．does he
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C．don"tI
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It is essential that all these figures ______ twice.
A．must be checked
B．be checked
C．is checked
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