单项选择题

They insist that a computer ______ only what our thinking humans have planned.

A．have done
B．do
C．be doing
D．does
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单项选择题
By the time he arrives in Beijing,we ______ here for two days.
A．will have stayed
B．have been staying
C．shall stay
D．have stayed
单项选择题
I was just to get up ______ a knock was heard on my door.
A．as
B．while
C．when
D．since
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