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
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单项选择题
The professor found himself constantly ______ the question: How could anyone do these things
A．poring
B．pondering
C．presiding
D．presuming
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单项选择题
We had n' t met for 20 years, but I recognized her ______ I saw her.
A．the moment
B．for the moment
C．the moment when
D．at the moment when
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