单项选择题
If the United States had built more homes for poor people in 1955, the housing problem now in some parts of the country ______ so serious.
- A．wouldn’t have been
B．will not be
C．wouldn’t be
D．will not have been
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It will be warmer and warmer, ______ more and more trees are turning green.
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Prisons in the country are short of staff, ______ means prison officers are overworked and underpaid.
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I don’t understand ______ he should have done something like that.
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