单项选择题

It is difficult to distinguish one twin ______ the other.

A．to
B．by
C．for
D．from
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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
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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