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

試題分析：短語辨析。A自從；B以防；C和往常一樣；D不久之后；句意：把你的鑰匙留給鄰居以免有一天你把自己鎖在外面。根據(jù)句意說明B正確。
點(diǎn)評：在平時的學(xué)習(xí)中注意對一些固定詞組的識記，以及這些詞組與不同的時態(tài)的連用。如A項(xiàng)要與現(xiàn)在完成時連用。
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