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 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
Anyone can get into the club, ______ he is a member there.
A．even if
B．unless
C．as that
D．so long as
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