They took ________ measures to prevent

未知题型

They took ________ measures to prevent poisonous gases from escaping.
A) fruitful B) beneficial
C) valid D) effective

【参考答案】

“他们采取了________措施防止有毒气体泄露”。effective“有效地，生效的”意指“能起作用的，能产生预期效果......

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