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Leave your key with your neighbor ________ you lock yourself out one day.
A.as long asB.even thoughC.in caseD.as if
C

试题分析:句意:留一把钥匙给你的邻居以防你有一天外出时把自己锁在门外。这里主句是祈使句,从句时是in case引导的条件状语从句。A.as long as只要;  B.even though 即使; C.in case万一,以防; D.as if好像。根据句意故选C。
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