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

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单项选择题
（） for a long time, the fields are all dried up.

A. There has been no rain
B. Having no rain
C. There having been no rain
D. There being no rain
单项选择题
What accusation would the Argentine officers face（）

A. Violation of human rights.
B. Involvement in illegal actions.
C. Planning anti-government activities.
D. Being part of the military rule.
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