The unemployment rate has become much lower ______ the government took these measures.

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问题 The unemployment rate has become much lower ______ the government took these measures.

选项 A、but
B、since
C、if
D、while

答案B

解析本题考查连词since的用法。since在句中意为“自从”，常用于引导一般过去时的从句，而主句部分则通常为完成时态。分析句子的时态可知，主句的时态为现在完成时，从句的时态为一般过去时，符合since的用法，而且符合句意，所以确定B)为本题的答案。

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大学英语三级B级

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