单项选择题

A．It should be raised by soldiers
B．It should be raised quickly by hand
C．It should be raised only by Americans
D．It should be raised by mechanical means
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单项选择题
A．It had its limitations.B．Its results were regarded as final.C．It was supported by the government.D．It was not sound theoretically.
A．It had its limitations.
B．Its results were regarded as final.
C．It was supported by the government.
D．It was not sound theoretically.
单项选择题
A．Because he had worked in a computer shop.B．Because he had written some computer programs.C．Because he is clever and works hard at his lessons.D．Because he had learnt to use computers at school.
A．Because he had worked in a computer shop.
B．Because he had written some computer programs.
C．Because he is clever and works hard at his lessons.
D．Because he had learnt to use computers at school.
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