2. 专升本
  3. Effective measures should be taken to ______ factories from sending out poisonous gases and waste water.

Effective measures should be taken to ______ factories from sending out poisonous gases and waste water.

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问题 Effective measures should be taken to ______ factories from sending out poisonous gases and waste water.
选项 A、avoid
B、conquer
C、prevent
D、protect
答案C
解析
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