Leave your key with your neighbor      you lock yourself out one day.
A． as long asB． even thoughC． in caseD． as if
C
A項意為“只要”；B項意為“盡管”；C項意為“以防”；D項意為“好像”。根據(jù)句意：把你的鑰匙留給你的鄰居，以防你把自己鎖在外面了。所以選C項。
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