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

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问题 ______announcing his retirement, Mr. Kinsley has been busy trying to train his replacement.

选项 A、Because
B、Once
C、Since
D、While

答案C

解析 备选答案均为连词,可一一代入后,选择最符合句意的。根据前一分句内容(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 hisretirement在意思上相当于since he announcedhis 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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