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
It is difficult to distinguish one twin ______the other.
A．to
B．by
C．for
D．from
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
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