单项选择题

What is now the United States might have been divided into several countries ______ the South ______ the Civil War.

A．had, won
B．if, won
C．should, win
D．were, to win
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单项选择题
While crossing the primitive forest, they all had guns with them for protection for fear that they ______ by the wild animals.
A．would be attacked
B．must be attacked
C．were attacked
D．be attacked
单项选择题
We shouldn't expect a technical innovation can be made perfect overnight. It has to be improved ______ in fact.
A．from cover to Cover
B．at a good pace
C．in succession
D．step by step
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