单项选择题

I think he studies very hard, ______

A．does he
B．doesn"t he
C．don"tI
D．do I
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单项选择题
It is essential that all these figures ______ twice.
A．must be checked
B．be checked
C．is checked
D．will be checked
单项选择题
He is ______ a horse.
A．stronger as
B．as stronger than
C．the strong as
D．stronger than
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