You needn't have apologized for your absence— ， it's hardly your fault.
A. therefore
B. however
C. meanwhile
D. besides
网友回答
A. therefore
B. however
C. meanwhile
(答案→)D. besides
解析：D 考察副词辨析。句意：你不必为你的缺席道歉，而且这不是你的错。Therefore因此，表示因果；however然而，表示转折；meanwhile同时，表示并列；besides此外，表示递进。根据句意说明D正确。