They took________measures to prevent poisonous gases from escaping.A、fruitfulB、

游客2023-09-30  24

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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