单项选择题

A．about
B．over
C．with
D．on
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单项选择题
A．discussingB．concerningC．studyingD．researching
A．discussing
B．concerning
C．studying
D．researching
单项选择题
A．To keep together in a racial group.B．Because they are discriminated against.C．For religious reasons.D．Because they don’t like other people.
A．To keep together in a racial group.
B．Because they are discriminated against.
C．For religious reasons.
D．Because they don’t like other people.
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