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
Although a teenager, Fred could resist______ what to do and what not to do.
A．being told
B．telling
C．to be told
D．to tell
单项选择题
The river was______ with waste from that factory. Some measures must be taken to stop its production.
A．corrupted
B．consumed
C．contaminated
D．infected
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