单项选择题

What has been the biggest sticking point throughout the negotiations

A．The issue of oil
B．The issue of federalism
C．The issue of trade
D．The issue of army
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单项选择题
A．adeptnessB．adaptationC．adoptionD．adaptability
A．adeptness
B．adaptation
C．adoption
D．adaptability
单项选择题
A．by means ofB．by way ofC．in the way ofD．not by
A．by means of
B．by way of
C．in the way of
D．not by
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