题目内容

Leave your key with a neighbor         you lock yourself out one day.
A．ever since B．in caseC．as usualD．soon after
B

试题分析：短语辨析。A自从；B以防；C和往常一样；D不久之后；句意：把你的钥匙留给邻居以免有一天你把自己锁在外面。根据句意说明B正确。
点评：在平时的学习中注意对一些固定词组的识记，以及这些词组与不同的时态的连用。如A项要与现在完成时连用。
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