单项选择题

We were excited to learn that the last month's sales______by 30%．

A．had increased
B．increase
C．are increasing
D．have increased
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单项选择题
Even in small companies,computers are a(n)______tool．
A．natural
B．essential
C．careful
D．impossible
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
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