__________ announcing his retirement, Mr. Kinsley has been busy tryi-考呗网题库移动版
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A.Because
B.Once
C.Since
D.While

参考答案C
解析: 备选答案均为连词,可一一带入后,选择最符合句意的。根据前一个分句内容(宣布退休)和后一分句内容(忙于培训他的接班人),since(自……以来)最恰当。since announcing his retirement在意思上相当于since he announced his retirement,前者使用现在分词来表达,后者使用从句来表达。

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