I called him many times, but I didn’t get through, maybe his mum _on the phone all the tim

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A. talked
(答案→)B. was talking
C. has talked
D. had talked
解析：考查时态。句意：我一直在给她打电话，但是我打不通，也许她的妈妈一直都在打电话吗？根据句意说明是在我打电话的那段时间里他妈妈一直都在打电话，指在过去的一段时间里一直都在发生的事情，故使用过去进行时来表示。故B项正确。