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
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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
单项选择题
Though I haven't seen him for years, I can ______ his voice on the telephone.
A．realize
B．discover
C．accept
D．recognize
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