单项选择题

By the time he arrives in Beijing, we ___________ here for two days.

A．will have stayed
B．shall stay
C．have been staying
D．have stayed
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单项选择题
The millions of calculations involved, had they been done by hand, all practical value by the time they were finished __________.
A．had lost
B．would have lost
C．would lose
D．should have lost
单项选择题
According to the American federal government, residents of Hawaii have the longest life ______ 77.2 years.
A．rank
B．span
C．scale
D．scope
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