单项选择题

A．Therefore
B．Nevertheless
C．Although
D．However
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单项选择题
A．constitutedB．educatedC．sophisticatedD．responsible
A．constituted
B．educated
C．sophisticated
D．responsible
单项选择题
A．averageB．regularityC．standardD．norm
A．average
B．regularity
C．standard
D．norm
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