中国银行

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

A.Because 
B.Once 
C.Since 
D.While

参考答案:C进入在线模考
【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。