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

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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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