单项选择题


A．decide
B．establish
C．mention
D．predict
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单项选择题
A．powerfulB．advancedC．developingD．industrialized
A．powerful
B．advanced
C．developing
D．industrialized
单项选择题
A．beforeB．becauseC．whenD．since
A．before
B．because
C．when
D．since
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