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

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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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