单项选择题

America will never again have as a nation the spirit of adventure as it ______ before the West was settled.

A．could
B．did
C．would
D．was
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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
Sometimes, changing our way of thinking, ______.
A．the problems become simpler and clearer
B．we will find the problems simpler and clearer
C．the simpler and clearer the problems will become
D．the problems will become simple and easy
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