Schools in the north tend to be better equipped, ______ those in the south are relatively poor.
A．a(chǎn)sB．unlessC．whenD．while
D

試題分析：考查連詞。A因為；B除非；C當……時候；D然而。句意：北方的學校趨向于更好的裝備，而那些南方的學校相對差點。故D正確。
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