They took ______ measures to prevent poisonous gases from escaping.

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问题 They took ______ measures to prevent poisonous gases from escaping.

选项 A、fruitful
B、beneficial
C、valuable
D、effective

答案D

解析本题测试形容词辨异。四个选项意思分别为：A．硕果累累的，有利的，成功的；B．对……有益，有利的，对……有好处的；C．有价值的；D．有效的，产生效果的。D项和句中的measures(措施)搭配正确。

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