The workers insist that the company should take measures to improve their working conditi

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A. attractive
(答案→)B. effective
C. impressive
D. conservative
解析：本题考查形容词辨析。attractive有吸引力的；effective有效的；impressive深刻印象的；conservative保守的,守旧的。句意：工人们坚持公司应当采取有效的措施来改善他们的工作条件。