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They took______measures to prevent poisonous gases from escaping.
They took______measures to prevent poisonous gases from escaping.
admin
2019-04-11
12
问题
They took______measures to prevent poisonous gases from escaping.
选项
A、fruitful
B、beneficial
C、valuable
D、effective
答案
D
解析
句意：他们采取了有效措施防止毒气泄漏。fruitful硕果累累的，成功的；beneficial对……有益的，有利的；valuable有价值的；effective有效的，产生效果的。
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