单项选择题


A．they were
B．it was
C．there was
D．there were
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单项选择题
A．usefulB．reliableC．necessaryD．exciting
A．useful
B．reliable
C．necessary
D．exciting
单项选择题
What is the decisive factor in future competition between nations
A．Oil.
B．Technological skill.
C．Natural resources.
D．Education.
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