Leave your key with your neighbor you lock yourself out one day.
A. as long as
B. even though
C. in case
D. as if
网友回答
A. as long as
B. even though
(答案→)C. in case
D. as if
解析：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。