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Leave your key with your neighbor      _you lock yourself out one day.
A.as long asB.in case C.even thoughD.as if
B
连词辨析。A只要;B以防;C即使;D似乎;结合句意可知B正确。句意:把你的钥匙留给邻居,以防有一天你把自己锁在家里。
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