单项选择题

______ the PLA men the villagers would not have survived the flood.

A．It had not been for
B．Had it not been for
C．Were it not for
D．Has it not been for
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单项选择题
It can be inferred that most of the pioneers referred to in the passage were originally from where in the United States（）

A．The desert.
B．The West.
C．The State of Mississippi.
D．The East.
单项选择题
28（）

A．takes
B．follows
C．learn
D．watch
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