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单选题
_________ some students are able to find employment after graduation, others will have to return to school and earn an advanced degree.
A
Since
B
While
C
Because
D
If
答案解析
正确答案：B
解析：
参考解析:连词辨析。题干中的some students...other...表明，两句话之间是对比关系，while在此用作并列连词，意为"而，然而”，表示前后两种状况的对比，为正确答案。其他选项A项since的用法主要有两种，一表示"自从...以来”，二表示"既然";C项不正确，因为前后两分句之间无引起与被引起的关系，故不能用引导原因状语从句because;D项if引导条件状语从句，意为"如果"，表示假如有从句的动作发生，就(不)会有主句的动作发生，在这里不合适。句意:一些学生毕业后能找到工作，而另外—些则不得不重返学校以修得更高的学位。
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