单项选择题

In no way ______ from practice.

A．theory can be separated
B．theory is separated
C．can theory be separated
D．has theory been separated
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单项选择题
I shall make the announcement ______ the beginning of the meeting.
A．to
B．for
C．at
D．in
单项选择题
The bread and butter ______ served for breakfast.
A．are
B．is
C．have
D．had been
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