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、sufficient
D、effective

答案D

解析本题考查形容词和名词的搭配。从语法上来说，四个选项都是正确的，都可以作定语。解答本题的关键是意思搭配合理。根据句子意思可知，最佳答案是选项D(有效的)。

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大学英语三级B级

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