Schools in the east tend to be better sponsored,______those in the west are rela

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问题 Schools in the east tend to be better sponsored,______those in the west are relatively poor.

选项 A、unless
B、until
C、while
D、since

答案 C

解析本题考查连词。unless表条件，意为“除非……”；until表时间，意为“直到……才”；while可用作并列连词表比较；since表原因，意为“既然”。分析句子关系可知，题干是两个并列的分句，表比较，因此C)为本题的答案。

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