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    He is only too ready to help others, seldom, ____, refusing them when they turn to him.

    A．if never B．if ever C．if not D．if any

    B

    解析试题分析：考查状语从句的省略。A如果从未有过；B如果曾经有过；C如果不；D如果有一些；句意：他非常乐于助人，如果曾经有过拒绝帮助别人，那也是很少的。根据句意说明如果曾经有过。故B正确。
    考点：考查状语从句的省略

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