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
Sam Wilson stamped the boxes of meat for the army with a large U.S. for ______.
A．Uncle Sam
B．United States
C．Soldiers
D．America
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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