在过去几十年里 政府采取了各种措施防止灾害发生。
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在过去几十年里，政府采取了各种措施防止灾害发生。
A.In the past few decades, the government has taken various measures to prevent disasters from happening.
B.In the past few decades, the government has taken various measures to prevent disasters.
C./
D./
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In the past few decades, the government has taken various measures to prevent disasters.