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
As a public relations officex, he is said ______ some very influential people.
A．to know
B．to be knowing
C．to have been knowing
D．to have known
单项选择题
Rod is determined to get a seat for the concert ______ it means standing in a queue all night.
A．as if
B．even if
C．provided
D．whatever
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