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 fruitful意为“有收获的；富有成效的”；beneficial意为“有利的，有益的”；sufficient意为“足够的，充分的”；effective意为“有效的”。根据句意进行分析，只有effective符合题意,故选D。

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大学英语三级B级

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