His ______ attempts to complain to his superiors were blocked and ignored.A、prof

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问题 His ______ attempts to complain to his superiors were blocked and ignored.

选项 A、proficient
B、persistent
C、consistent
D、sufficient

答案 B

解析形容词辨析题。persistent意为“一再发生的，持续不断的，坚持不懈的”；proficient意为“精通的，熟练的”；consistent意为“前后一致的，相符的”；sufficient意为“充足的，足够的”。根据句意选择B。

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