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
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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
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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