I ‘ve been telling you_____not to do that ，but you neve listened to me.That ’s why you gotinto trouble.
C
timeandagain相当于“timeandtimeagain”，意思是“一次又一次地，再三地”，正合题意。attimes指“有时，偶尔”。forthetimebeing意思是“暂时”。不存在b项这种表达法。
He‘sworkinghard_____.
Beingextremely_____tothecold，Idonotlikeskating.
Ifhe_____thestorekeeper‘sscissors，hewouldhaveforgottentobuyapair.