A lesson from the terrible drought(干旱) that hit some parts of southwestern China this year

问题补充：

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.

A. should be

B. should not have been

C. ought to have been

D. must be

答案：

A. should be

B. should not have been

(答案→)C. ought to have been

D. must be

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