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
We must ______ early in the morning so as to catch the first train.
A．set up
B．set out
C．set about
D．set aside
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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