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A lesson from the terrible drought(干旱) that hit some parts of southwestern China this year is that m...
题目内容：
A lesson from the terrible drought(干旱) that hit some parts of southwestern China this year is that more anti-drought projects ______ built in the past years.
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A．should be |
B．should not have been |
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C．ought to have been |
D．must be |
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