They took______measures to prevent poisonous gases from escaping.A、fruitfulB、be

游客2023-11-11  23

问题 They took______measures to prevent poisonous gases from escaping.

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

答案 D

解析 形容词辨析题。fruitful意为“有收获的”;beneficial意为“有益的”;valid意为“正当的,有根据的,有效的”;effective意为“有效的,起作用的”。根据句意,D为答案。
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