单项选择题

The king was totally unaware that his reign was at ______ .

A．danger
B．question
C．stake
D．hazard
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单项选择题
The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A．had they been done
B．they had been done
C．having been done
D．they were done
单项选择题
The opportunity ______ in a prestigious corporation is a dream for the graduates nowadays in many countries.
A．to work
B．working
C．worked
D．to be working
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