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
The bread and butter ______served for breakfast.
A．are
B．is
C．have
D．had been
单项选择题
To travel from England to Scotland you ______a passport.
A．mustn’t have
B．haven’t got
C．don’t need
D．needn’t
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