We’d better stay here a little longer    he turns up unexpectedly.
A．a(chǎn)lthoughB．in caseC．sinceD．if only
B

試題分析：考察連詞辨析。A盡管；B以防…；C既然，自從；D要…就好了。句義：我們最好在待一會(huì)，以防他突然出現(xiàn)。根據(jù)句義說明B項(xiàng)正確。
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