单项选择题

Even in small companies,computers are a(n)______tool．

A．natural
B．essential
C．careful
D．impossible
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单项选择题
Of more money had been invested,we______a factory in Asia．
A．will setup
B．have set up
C．would have set up
D．had set up
单项选择题
Please______your report carefully before you hand it in to me．
A．turn to
B．bring about
C．go oyer
D．putup
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