__________ announcing his retirement, Mr. Kinsley has been busy trying to train his replacement.

A．Because

B．Once

C．Since

D．While

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参考答案

答案解析

【答案】C。解析：备选答案均为连词，可一一带人后，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)，(C)“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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