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

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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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