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We’d better stay here a little longer    he turns up unexpectedly.

A.although B.in case C.since D.if only

B

解析试题分析:考察连词辨析。A尽管;B以防…;C既然,自从;D要…就好了。句义:我们最好在待一会,以防他突然出现。根据句义说明B项正确。
考点:考察连词辨析

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