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Don’t be afraid of asking for information ______it is needed.

A．when B．after C．although D．unless

A

解析試題分析：句意：當它是被需要的時候，不要害怕去詢問信息。分析選項：when 當...時候；after在...之后；athough雖然；unless="if" not除非，根據(jù)句意是當…..時候解，故選A
考點：考查連詞的用法。

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