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  3. After scientists did some research ______the health of workers, the government tried to find some way to meet their demand.

After scientists did some research ______the health of workers, the government tried to find some way to meet their demand.

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问题 After scientists did some research ______the health of workers, the government tried to find some way to meet their demand.
选项 A、into
B、off
C、about
D、for
答案A
解析
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