单项选择题

Had the United States built more homes for the poor people in 1955, the housing problem now in some parts of the country ______ so serious.

A．wouldn't be
B．will not have been
C．wouldn't have been
D．would have not been
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单项选择题
Wind motion can be observed in the atmosphere by ______ the trails of meteors passing through it.
A．to watch
B．watching
C．watched
D．watch
单项选择题
In such a changing and complex society, formerly simple solution to informational needs become ______.
A．confusing
B．acceptable
C．complicated
D．feasible
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