Customers can obtain a membership card______they present their personal information.

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问题 Customers can obtain a membership card______they present their personal information.

选项 A、however
B、in case
C、only
D、as long as

答案D

解析语法：连词1．选项由连词和副词构成。2．空格后接句子，因此副词A、C选项排除。3．原文的意思是只有在“提供信息”的条件下才能“收到会员卡”，因此连词as long as为正确答案。C选项的only若为only if也为正确答案。B选项in case意为“以防……”，与文意不符。

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