these interruptions,the meeting would have finished earlier.A. Except forB. But forC. A

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A. Except for
(答案→)B. But for
C. Apart from
D. Other than
解析：   考查介词短语与虚拟语气。从句中的“would have finished earlier”可知本句是对过去发生事情的虚拟，因此选择but for“要不是……”。而except for,apart from和other than都表示“除了……之外”，但不用于虚拟语气。