单项选择题

I think he studies very hard, ______

A．does he
B．doesn't he
C．don't I
D．do I
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单项选择题
My parents always buy ______ my birthday.
A．anything nice to
B．anything nice for
C．something nice to
D．something nice for
单项选择题
In ______ century, computers will be used more widely.
A．twenty-one
B．the twenty-one
C．twenty-fast
D．the twenty-first
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